Megmeet MC200-8AD Manuale utente

MC200-8AD Analog Input Module

User Manual

Note:

To reduce the chance of accident, please carefully read the operating

instructions and safety precautions prior to use. Only adequately trained

personnel shall install or operate this product. In operation, strict compliance

with applicable safety rules in the industry, the operating instructions and

safety precautions in this book is required.

1 Product Description

1.1Function

●MC200-8AD analog input module (or MC200-8AD) is applicable to

MC200 series PLC. It is one of MC200 PLC’s extension modules, also a

special function module.

●MC200-8AD can convert the input analog signal into digital signal, with its

8 analog signal input channels. The AD conversion resolution is 12 bits.

●Easy selection between voltage and current input signal through

connection and easy selection among different measurement ranges of

–10V~10V, –5V~5V/–20mA~20mA and –100mV~100mV through

programming.

●MC200-8AD exchanges information with the basic module through Buffer

Memory (BFM). The BFM has 68 units, each consisting of 16 bits.

●MC200-8AD digital part consumes a maximum current of 70mA (5V),

analog part consumes a maximum current of 50mA (24V).

1.2 Structural Dimensions

See Figure 1-2 for MC200-8AD dimensions. Weight: 0.3kg.

Φ4.5

Figure 1-2 MC200-8AD structural dimensions (Unit: mm)

2 Port Description

2.1 Appearance

MC200-8AD extension cable port and user port are both covered up, as

shown below:

Extension cable

Extension port cover

User port cover

EC 20 -8AD

POWER

24V

RUN

Figure 2-1 MC200-8AD port appearance (covered)

Open the cover, you will see the extension cable port and user port as shown

in Figure 2-2.

The extension cable connects MC200-8AD to the system, while the extension

port connects MC200-8AD to another extension module of the system. See

section 2.3 Connecting Into System for details.

2.2 Port Description

MC200-8AD user port is defined in Table 2-1.

I2+24V-

V1+

V2+

I1+24V+ VI- V3+

V4+

I3+

I4+

V5+

V6+

I5+

I6+

V7+

V8+

I7+

I8+

Extension cable

User port

Extension port

EC 20-8AD

POWE R

R U N

24V

2 4 6 8 10 12 14 16 18 20

17 1913 159 115 71 3

Figure 2-2 MC200-8AD port diagram (covers removed)

Table 2-1 MC200-8AD user port definition

Terminal

Name

Description

24V+

Analog power supply 24V+

24V-

Analog power supply 24V-

VI-

Analog channel signal negative input

GND

V1+

Positive voltage analog-signal input of CH1

V2+

Positive voltage analog-signal input of CH2

I1+

Positive current analog-signal input of CH1

I2+

Positive current analog-signal input of CH2

V3+

Positive voltage analog-signal input of CH3

V4+

Positive voltage analog-signal input of CH4

I3+

Positive current analog-signal input of CH3

I4+

Positive current analog-signal input of CH4

V5+

Positive voltage analog-signal input of CH5

V6+

Positive voltage analog-signal input of CH6

I5+

Positive current analog-signal input of CH5

I6+

Positive current analog-signal input of CH6

V7+

Positive voltage analog-signal input of CH7

V8+

Positive voltage analog-signal input of CH8

I7+

Positive current analog-signal input of CH7

I8+

Positive current analog-signal input of CH8

Note: an input channel cannot receive both voltage signals and current signals at

the same time. If you intend to use a channel for current signal measurement, short

its voltage signal input terminal and current signal input terminal.

2.3 Connecting Into System

MC200-8AD is applicable to MC200 series PLC system. It connects to the

system through its extension cable, as shown in Figure 2-3. You can connect

it to the system simply by inserting its extension cable into the extension port

of the basic module or any other extension module in the system.

Basic module Extension module

Removing extension port cover

before connection

Extension cable

Figure 2-3 Connection between MC200-8AD and basic module

After being connected into the system, MC200-8AD‘s extension port can be

used for connection with other MC200 series extension modules, such as IO

extension module, MC200-4DA, MC200-4TC, and of course MC200-8AD.

You can extend the basic module of MC200 series PLC by adding multiple IO

extension modules and special functional modules. The quantity of the

extension modules that can be added depends on the power capacity of the

basic module. For details, refer to the section of MC200 Series PLC User

Manual dealing with power capacity.

2.4 Wiring

Figure 2-4 shows the wiring of the user port. Pay attention to the following 5

points in wiring

1. Use twisted screen cables as the analog input cables and separate them

from power cable or any cable that may generate electrical interference.

2. If the input signal fluctuates or electrical interference exists, it is advisable

to connect a smoothing capacitor (0.1µF~0.47µF/25V).

3. If a channel is used for current input, short its voltage input terminal and

current input terminal.

4. Properly ground the module’s PG terminal.

5. The basic module’s 24Vdc auxiliary output power or other qualified power

supplies can be used as the power source of the module’s analog circuit.

V1+

I1+

AGND

CH1

Voltage input

Current input

24V+

24V-

DC/DC

converter AGND

+5 V

-5 V

EC20-8 AD

V8+

I8+ CH 8

VI -

①

②

③

④

150kΩ

250Ω50kΩ

150kΩ

250Ω50kΩ

DC24V(-15%～+20%)

50mA

⑤

Figure 2-4 MC200-8AD user port wiring

3 Usage

3.1 Technical Specification

The environmental parameters of MC200-8AD are the same as those of

MC200 basic module. Refer to MC200 Series PLC User Manual for details.

See Table 3-1 and Table 3-2 for other technical specification.

Table 3-1 Power specificaiton

Item

Specification

Analog circuit

24Vdc (-15%/+20%), maximum allowable ripple voltage 5%,

≤50mA (from basic module’s auxiliary power supply or external

source)

Digital circuit

5Vdc, ≤70mA (from internal power supply of the basic module)

Tabel 3-2 Performance specification

Item

Specification

Conversion speed

12ms/channel (normal speed), 4ms/channel (fastest)

Analog

input

range

Voltage input

-10V~10V, input

impedance 200kΩ

Eight channels can be used at

the same time, input range

selectable by setting BFM (see

Table 3-4 for details)

Current input

-20mA~20mA, input

impedance 250Ω

Digital output

Default: -2000~2000

Setting range: -10000~10000

Resolution

Voltage input

Depending on the input range (see Table 3-5)

Current input

10µA

Accuracy

-10V~10V, -5V~5V, -20mA~20mA: ±1%

-100mV~100mV: ±5%

Isolation

Between analog circuit and digital circuit:

optical-coupler isolation.

Between analog circuit and external power supply:

DC/DC converter isolation.

Between analog channels: no isolation

3.2 Buffer Memory

MC200-8AD exchanges data with the basic module through BFM. The basic

module uses TO command to write data into the BFM of MC200-8AD to

configure MC200-8AD, and uses FROM command to read AD conversion

result and other data from the BFM of MC200-8AD.

Table 3-3 describes the contents of the BFM of MC200-8AD.

Table 3-3 MC200-8AD BFM content

BFM

Content

Remark

Prop.

#100~

#107

Respective averages of

CH1~CH8

Respectively average values

of channels 1 ~ 8

#200~

#207

Current values of CH1~CH8

Respectively current values of

channels 1~ 8

#300

Error status word

#400

Initialization

Default: 0

W&R

#500

Setting change enable

Default: 1 (enable)

0: disable

R&W

#600

Input mode selection 0

Default: H0000

R&W

#601

Input mode selection 1

Default: H0000

R&W

#700~

#707

Average sampling times of

channels 1 ~ 8

Defaults: 8

R&W

#800

Channel characteristics setting

confirmation command 0

Default: H0000

R&W

#801

Channel characteristics setting

confirmation command 1

Default: H0000

R&W

#900

CH1-D0

Default: 0 (input mode 0)

R&W

#901

CH1-A0

Default: 0 (input mode 0)

#902

CH1-D1

Default: 2000 (input mode 0)

R&W

#903

CH1-A1

Default: 10000 (input mode 0)

#904

CH2-D0

Default: 0 (input mode 0)

R&W

#905

CH2-A0

Default: 0 (input mode 0)

#906

CH2-D1

Default: 2000 (input mode 0)

R&W

#907

CH2-A1

Default: 10000 (input mode 0)

#908

CH3-D0

Default: 0 (input mode 0)

R&W

#909

CH3-A0

Default: 0 (input mode 0)

#910

CH3-D1

Default: 2000 (input mode 0)

R&W

#911

CH3-A1

Default: 10000 (input mode 0)

#912

CH4-D0

Default: 0 (input mode 0)

R&W

#913

CH4-A0

Default: 0 (input mode 0)

#914

CH4-D1

Default: 2000 (input mode 0)

R&W

#915

CH4-A1

Default: 10000 (input mode 0)

#916

CH5-D0

Default: 0 (input mode 0)

R&W

#917

CH5-A0

Default: 0 (input mode 0)

#918

CH5-D1

Default: 2000 (input mode 0)

R&W

#919

CH5-A1

Default: 10000 (input mode 0)

#920

CH6-D0

Default: 0 (input mode 0)

R&W

#921

CH6-A0

Default: 0 (input mode 0)

#922

CH6-D1

Default: 2000 (input mode 0)

R&W

#923

CH6-A1

Default: 10000 (input mode 0)

#924

CH7-D0

Default: 0 (input mode 0)

R&W

#925

CH7-A0

Default: 0 (input mode 0)

#926

CH7-D1

Default: 2000 (input mode 0)

R&W

#927

CH7-A1

Default: 10000 (input mode 0)

#928

CH8-D0

Default: 0 (input mode 0)

R&W

#929

CH8-A0

Default: 0 (input mode 0)

#930

CH8-D1

Default: 2000 (input mode 0)

R&W

#931

CH8-A1

Default: 10000 (input mode 0)

#1000

AD sampling speed selection

command 1

Default: 0 (12ms/CH).

1: fast (4ms/CH)

R&W

#4000

Module usage time counting

(low digit)

Default: 0

#4001

Module usage time counting

(high digit)

Default: 0

#4094

Module software version

H1000

#4095

Module ID

H1082

Note:

1. The basic module can use TO command to write data into BFMs marked

R&W only, but it can use FROM command to read data from any BFM,

including R&W and RO BFMs. When reading from reserved BFMs, the

obtained value is 0.

2. BFM#600&BFM#601: channel mode setting. These 2 are hexadecimal

figures in the format of H×4×3×2×1. In BFM#600, ×1is the setting for CH1,

×2is the setting for CH2, and so on. Whereas in BFM#601, ×1is the setting for

CH5, ×2is the setting for CH6, and so on. See the following figure:

Channel 1



600#

2

1



Channel 2

Channel 3

Channel 4

Channel 5



601#

2

1



Channel 6

Channel 7

Channel 8

See Table 3-4 for the meaning of “X”. When a channel is set between 3 and F

(closed), the channel will not perform A/D conversion.

Table 3-4 Meanings of X in the format

Status information

In range: -10V~10V (resolution: 5mV)

Input range: -5V~5V or -20mA~20mA (resolution: 2.5mV or 10µA)

Input range: -100mV~100mV (resolution: 0.05mV)

3-F

Channel closed

For example, if BFM #600 is set to H0123, it means that:

CH1 is closed

The input range of CH2: -100mV~100mV

The input range of CH3: -5V~5V or -20mA~20mA

The input range of CH4: -10V~10V

3. BFM#700~BFM#707: average sampling times setting. Range: 1 ~ 4096. If

the setting is outside this range, the value will be reset to the default 8. You

can select 1 for fast operation.

4. BFM#200~BFM#207: storing the current value of input data. The average

values are stored in BFM#100~BFM#107.

5. BFM#800&BFM#801: channel characteristics setting confirmation

command. After setting the channel characteristics (from BFM#900-

BFM#931), you need to write 1 into the appropriate hexadecimal data bit to

validate the setting and thereby change the channel’s output characteristics.

This command will clear automatically after being executed correctly. The

format is H×4×3×2×1, where ×1, ×2, ×3, ×4in BFM#800 are respectively the

commands for CH1, CH2, CH3 and CH4, while in BFM#801, for channels 5,

6, 7 and 8.

6．BFM#900~BFM#931: channel characteristics settings, which are set using

two-point method. D0 and D1 represent the channel’s digital outputs, while

A0 and A1, in mV unit, represent the channel’s actual inputs. Each channel

occupies 4 characters. To simplify the setting operation without affecting

functions, A0 and A1 are respectively fixed to the analog 0 and max value in

the current mode. After changing the channel mode (BFM #600&#601), A0

and A1 will change automatically according to the mode. They are user

unadjustable.

Note: If the channel input is current signal (-20mA~20mA), the channel mode

should be set to 1. As the channel’s internal measurement is based on

voltage signal, current signals should be converted into voltage signals

(-5V~5V) by the 250Ω resistor at the current input terminal of the channel. A1

in the channel’s characteristics setting is still in mV unit, i.e., 5000mV

(20mA×250Ω =5000mV).

7. See Table 3-5 for the status information of BFM#300.

Table 3-5 Status information of BFM#300

Bit status of BFM#300

ON (1)

OFF (0)

b0: error

b1 or b2 is ON, AD conversion of

all channels stopped

No error

b1: channel

characteristics setting

error

Channel characteristics setting

error in BFM

Channel

characteristics

setting normal

b2: power supply failure

24Vdc power supply failed

Power supply

normal

b3: hardware fault

AD converter or other hardware

faulty

Hardware normal

b4~b9: reserved

b10: digital range error

A/D conversion digital output

exceeds the range of -2048 ~

2047

Digital output value

normal

b11: average sampling

times setting error

Setting outside normal range (in

this case, the previous valid

setting will be restored)

Setting within

normal range:

1~4096

b12~b15: reserved

8. BFM#400: Initialization command. When BFM#400 is set to 1, all module

parameters will be reset to defaults, and BFM#400 will restore to 0

automatically.

9. BFM#500: setting change enable. Setting it to 1 allows users to change the

characteristics settings. Setting it to 0 inhibits change in characteristics

settings.

10. BFM#1000: AD sampling speed selection command. Writing 1/0 into

BFM#1000 will change AD conversion speed. 0: normal speed,

12ms/channel. 1: fast, 4ms/channel.

Note that, during programming, the BFM#700~#707 will be reset to the

defaults when BFM#1000 is changed. After changing the conversion speed,

you can set BFM#700~#707 again according to the actual needs.

11. BFM#4000&BFM#4001: module’s timing information in hexadecimal

format. Unit: second.

12. BFM#4094: module software version. It can be queried through FROM

command.

13. BFM#4095: module ID. The ID of MC2008ADZ is H1082. The user

program in PLC can use this ID to identify the module before

transmitting/receiving data.

4 Setting Characteristics

The input channel characteristic of MC200-8AD is the linear relationship

between the channel’s analog input A and digital output D. It can be set by the

user. Each channel can be considered as the model shown in Figure 4-1. As

it is of linear characteristics, the channel characteristics can be defined by

just two points: P0 (A0, D0) and P1 (A1, D1), where D0 is the channel’s

digital output corresponding to analog input A0, and D1 is the channel’s

digital output corresponding to analog input A1.

Channel D

Digital output

Analog input

Channel model

A(0.1℃)

Channel characteristic setting

A0 A1

D(0.1℃)

Figure 4-1 Channel characteristics of MC200-8AD

To simplify the operation process without affecting functions, A0 and A1 are

respectively fixed to the analog 0 and max analog value in the current mode.

That is to say, in Figure 3-1, A0 is 0 and A1 is the max analog input value in

the current mode. After changing the channel mode (BFM #600&#601), A0

and A1 will change automatically according to the mode. Users cannot

change their values.

If you just set the channel mode (BFM#600&#601) without changing the D0

and D1 values of each channel, the channel characteristics vs. mode should

be as shown in Figure 4-2. Characteristics A in Figure 4-2 shows the factory

default settings.

2000

-10000 10000

- 2000

A(mV)

A Mode 0 (default)

2000

-100 100

- 2000

A (mV)

C Mode 2

B Mode 1

2000

- 5000 5000

- 2000

A( mV)

Figure 4-2 Characteristics vs. mode with D0 and D1 unchanged

You can change the channel characteristics by changing D0 and D1. Setting

ranges of D0 and D1 are both from -10000 to 10000. If the setting is outside

this range, MC200-8AD will not accept it, and just maintain the original valid

setting. Figure 4-3 gives an example of characteristic change for your

reference.

1000

-100 100

A ( mV )

500 P 0

C. Mode 2, D0=500, D1=1000

Input 100mA: output digital signal 1000

Input 0mA: output digital signal 500

Input -100mA: output digital signal 0

2000

-5000 5000

-3000

A(mV )

-500 1000

B. Mode 1, D0=-500, D1=2000

Input 5V(or 20mA): output digital signal 2000

Input 1V(or 4mA): output digital signal 0

Input -5V(or -20mA): output digital signal -3000

10000

-10000 10000

-10000

A ( mV )

A. Mode 0, D=0,D1=1000

Input 10V: output digital signal 10000

Input 0V: output digital signal 0

Input -10V: output digital signal -10000

Figure 4-3 Changing characteristics

5 Application Example

5.1 Basic Application

Example: MC200-8AD module address is 0. Use channels 1 and 3 for voltage

signal input of respectively -10V~10V and –100mV~100mV and CH2 for

current signal input (-20mA~20mA). Close CH4. Use channels 5, 6 and 7 for

voltage signal input of respectively -10V~10V, -5V~5V and -100mV~100mV

and close CH8. Set the average sampling times to 4, and use data registers

D1, D2, D4, D5 and D6 to receive the converted average value.

5.2 Changing Characteristics

Example: The MC200-8AD module address is 0. Use channels 1 and 3 for

voltage signal input of respectively -10V~10V and -100mV~100mV and CH2

for current signal input (-20mA~20mA). Close CH4. Use channels 5, 6 and 7

for voltage signal input of respectively -10V~10V, -5V~5V and

-100mV~100mV and close CH8. The following example will realize the

characteristic change as shown in Figure 4-3: channels 1 and 5 realize

characteristic A, channels 2 and 6 realize characteristic B, channels 3 and 7

realizes characteristic C. Channels 4 and 8 are closed. Use data registers D1

to D6 to receive the converted averages.

6 Operation Inspection

6.1 Routine Inspection

1. Check that the wiring meets requirements (refer to section 2.4 Wiring).

2. Check that the extension cable of MC200-8AD is properly connected to the

extension port.

3. Check that the 5V and 24V power supplies are not overloaded. Note: the

digital circuit of MC200-8AD is powered by the basic module through the

extension cable.

4. Check the application, make sure that the correct operation method and

parameter setting range are selected.

5. Set the MC200 basic module to RUN state.

6.2 Fault Inspection

In case of MC200-8DA malfunction, check the following items.

●the POWER indicator

ON: the extension cable properly connected

OFF: check the extension cable connection and the basic module

●the wiring

●the 24V indicator

ON: 24Vdc power supply normal;

OFF: either 24Vdc power supply faulty, or MC200-8AD faulty

●the RUN indicator

Flashing quickly: MC200-8AD normal

Off or flashing slowly: check BFM#34

Notice

1. The warranty range is confined to the PLC only.

2. Warranty period is 18 months, within which period Megmeet Network

Power conducts free maintenance and repairing to the PLC that has any fault

or damage under the normal operation conditions.

3. The start time of warranty period is the delivery date of the product, of

which the product SN is the sole basis of judgment. PLC without a product

SN shall be regarded as out of warranty.

4. Even within 18 months, maintenance will also be charged in the following

situations:

Damages incurred to the PLC due to mis-operations, which are not in

compliance with the User Manual;

Damages incurred to the PLC due to fire, flood, abnormal voltage, etc;

Damages incurred to the PLC due to the improper use of PLC

functions.

5. The service fee will be charged according to the actual costs. If there is any

contract, the contract prevails.

6. Please keep this paper and show this paper to the maintenance unit when

the product needs to be repaired.

7. If you have any question, please contact the distributor or our company

directly

Shenzhen Megmeet Control Technology Co.,Ltd

Address: 5th Floor,Block B，Ziguang Information Harbor, Langshan Rd,

Science& Technology Park, Nahshan District, Shenzhen

Homepage: www.megmeet.com

without notice.

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