Astral Pool CONTROL BASIC PLUS Manuale utente

0000138174 Rev.1.1

CONTROL BASIC PLUS PUMP MODBUS

INSTALLATION MANUAL

HANDBUCH

MANUAL DE INSTALACION

MANUEL D’INSTALLATION

MANUALE D’INSTALLAZIONE

MANUAL DE INSTALAÇÃO

0000138174 Rev.1.1

0000138174 rev.1.1 1 
 
 
 Control Basic Plus pump ModBus Manual 
 
1INTRODUCTION TO MODBUS AND PRODUCT 
1.1 PRINCIPLE OF OPERATION 
1.2 BASIC CHARACTERISTICS 
2FRONT PANEL CONTROLS 
2.1 STATUS INDICATORS 
2.2 CONTROL BUTTONS 
3CONNECTIONS 
3.1 ELECTRICAL CONNECTIONS 
3.1.1 RS-485 STANDARD CONNECTION 
3.1.2 BUS ISOLATION AND TERMINATION RESISTORS 
4MODBUS FUNCTIONS 
4.1 FUNCTIONS SUPPORTED 
4.2 EXCEPTION RESPONSES 
5DEVICE DESCRIPTION AND CONFIGURATION 
5.1 GENERAL DESCRIPTION 
5.2 STATE MACHINE DIAGRAM 
5.3 CONFIGURING THE PUMP 
5.3.1 ADDRESS 
5.3.2 COMMUNICATIONS SETUP 
5.4 WATCHDOG TIME OUT 
5.4.1 WATCHDOG TIME 
6CONTROLLING THE PUMP 
6.1 SET-POINT SETTING 
7MONITORING PUMP STATUS 
7.1 READING PUMP MODE 
7.2 READING PUMP MEASUREMENTS 
7.3 READING OTHER PUMP STATUS INFORMATION 
8WARNINGS AND ALARMS 
8.1 READING CURRENT WARNING/ALARM STATUS 
8.2 READING HISTORICAL ALARM DATA 
9BASIC MODBUS-RTU REGISTER MAP 
 10 PRODUCT REVISION 
 
 
 
 
 
 
 
 
 
 

0000138174 rev.1.1 2

1INTRODUCTION TO MODBUS AND PRODUCT

Thank you very much for purchasing our Control Basic Plus pump with MODBUS-RTU features. This manual is intended

for the professional installer; if you are not, please consult your official distributor. MODBUS is an open field bus

successfully used throughout the world to connect field devices to a main controller. This is the reason why MODBUS

has been our choice to offer to our customers and partners an automated solution, easy to integrate not only with our

brand products but also with a vast collection of third party components and controllers. MODBUS, MODBUS-RTU and

other related names are registered trademarks of MODBUS Organization. Further information and documentation can be

found at www.Modbus.org.

1.1 PRINCIPLE OF OPERATION

The Control Basic Plus pump implements MODBUS-RTU as a control-communications feature that allows operation and

supervision in a MODBUS automation environment. Preventive maintenance and fault analysis is also possible thanks to

the implementation of internal registers in the pump with the more relevant operational and error events. When the pump

is installed, you are not forced to connect it to a MODBUS system, if you do not aim to control or supervise it externally.

The pump can run in local mode, as traditionally done, without using the MODBUS layer. However, we expect that the

implementation of MODBUS-RTU in the pump will open to our advanced customers and partners a wide range of new

opportunities and implementation scenarios, thanks to the simplicity and flexibility of the MODBUS-RTU layer. Using a

MODBUS-RTU message, the pump can start & stop by set-point report errors and so on, giving to the user/installer a

wide range of new features.

1.2 BASIC CHARACTERISTICS

The MODBUS communication system provides a Master/Slave implementation among devices sharing a physical

connection. For the pump, the physical connection is a RS-485 half-duplex serial layer, which has been chosen among

other options due to its wide implementation and ruggedness. The pump is designed to run in a single-master system. In

this implementation, Master and Slave devices have clear roles, and it is crucial to clear understand these roles for

proper system implementation.

Master Device

Device that controls the data exchange in the bus and, if necessary, implements co-ordination tasks among

different slaves (i.e. PLC Programmable Logic Controller, SCADA, etc.).

Slave Device

Devices connected to the bus that responds to the requests from the master, either reporting information or

executing tasks as per Master request.

2FRONT PANEL CONTROLS

The pump's front panel contains various buttons and indicators, to indicate and control the state of the pump. These are

shown in Image 1.

Image 1 Panel indicator

0000138174 rev.1.1 3

2.1 STATUS INDICATORS

The large LCD displays key information about the status of the pump, including current mode of operation, set-point and

warnings or faults.

2.2 CONTROL BUTTONS

There are four control buttons on the pump’s front panel. The function of all these buttons is explained in detail in the

pump’s User Manual.

3CONNECTIONS

3.1 ELECTRICAL CONNECTIONS

3.1.1 RS-485 STANDARD CONNECTIONS

The Control Basic Plus pump implements ANSI/TIA/EIA-485 standard communications, also known as RS-485. Some

manufacturers swap the “A” and “B” connections, which may cause confusion, but this is not the case with the pump.

Keep this in mind when connecting the pump to MODBUS appliances from other companies.

PIN N°

Description

T+R+ (B)

T-R- (A)

GND

Not used

Image 2 Bus connection

Some manufacturers swap the A and B connections" which may cause confusion, in this device B is the T+R+ and the A

is the T-R-, the following pinout correspond to the female connector (the connector installed on the Pool Basic

Double/Control Basic/Optima Plus)

The recommended wiring for a MODBUS-RTU communication is based on a linear structure, active bus with termination

at both ends. It is possible to couple and uncouple devices during operation without affecting other devices. The wire

shall be twisted and shielded according to EN 50170.

The values of transmission rate supported by the device allows maximum cable length of 1,200 m without repeaters, or

up to 10 km using repeaters, when installed according to the standard.

For the balanced pairs used in an RS-485 system, a Characteristic Impedance with a value higher than 100 Ohms is

preferred, especially for 19200 and higher baud rates.

0000138174 rev.1.1 4

3.1.2 BUS ISOLATION AND TERMINATION RESISTORS

If the communication bus is accessible by the user, it shall be double insulated. In general, the accessibility of the bus to

users will depend on each installation; safety isolation has been implemented in the pump’s physical bus layer.

Moreover, for safety purposes, it is recommended to ensure that other devices sharing this bus also implements this

insulation. Additionally, the use of bus insulated devices also increases the equipment reliability, larger immunity to

electromagnetic interference, longer life, and more stability over the range of temperatures. Whenever single or multiple

devices are sharing a bus physical connection, it is recommended to use terminating resistors at the ends of the bus,

even more so when use large cable length or high speed data rates. The terminating resistor is used to prevent an RF

signal from being reflected back from the end, causing interference. The terminating resistor must be in both ends of the

bus, connected in parallel (as shown in the image below). A typical value of this resistance is 120Ω, 0.5W. The value of

the resistor must be the same in both ends. The terminating resistors are labelled “R_T” in the diagram.

Image 4. Interconnection of devices

4MODBUS FUNCTIONS

4.1 FUNCTIONS SUPPORTED

Please, be careful when issuing MODBUS commands, and make sure that the function used is correct.

Functions in register access mode are implemented according to the MODBUS-RTU standard described in

http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf In general registers are unsigned 16 bit coded.

0x03 READ HOLDING REGISTERS

0x04 READ INPUT REGISTERS

0x10 WRITE MULTIPLE REGISTERS

4.2 EXCEPTION RESPONSES

Exception responses are implemented according to the MODBUS-RTU standard, described in the chapter MODBUS

exception responses: http://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf

The exceptions implemented are: 1,2,3 and 6.

5DEVICE DESCRIPTION AND CONFIGURATION

5.1 GENERAL DESCRIPTION

Using MODBUS commands, the pump’s set-point can be changed, also, various state and diagnostic information can be

retrieved.

When a simultaneous request is made through MODBUS, the front panel has the priority. It's possible only to read

certain parameters.

It is the operator’s responsibility to check that values sent are consistent with the application.

In this manual, the numbers in hexadecimal have been represented with the format 0xZZ, where ZZ is the number.

0000138174 rev.1.1 5

5.2 STATE MACHINE DIAGRAM

When the pump powers on, it will resume operation in normal operating mode. The current state is shown on the LCD.

The pump has four modes of operation: Normal Operating, Calibration, Programming and Logging. The pump can move

from any one state to another. Image 5 shows this.

Image 5. State Diagram

5.3 CONFIGURING THE PUMP

5.3.1 ADDRESS

The address of the pump in the bus is set on the pump (0x00 only read in holding register).

ID_Address:

Address of the pump in the bus.

Factory setting:

0x01

The factory default is 0x01. However if more than one pump wants to be implemented both ID_Address values must not

match. This situation can be avoided by changing from device.

5.3.2 COMMUNICATIONS SETUP

It's possible enabling or disabling the communication, change the watchdog configuration, watchdog time, address, parity

and baudrate.

5.4 WATCHDOG TIME OUT

The watchdog is a timer implemented in the pump to check if the communications in the bus is still alive. When the pump

loses communication for a time greater than the watchdog_time, the pump perform the action selected in: wdg config.,

wdg alarm, hardware reset, com. reset and stop dosage.

0000138174 rev.1.1 6

5.4.1 WATCHDOG TIME

The watchdog triggering time is defined in the holding register 0x10. This time is set in seconds. A value of 0 means that

the watchdog is disabled, and this is the default value.

To enable the watchdog feature, set the watchdog_time to a value different from 0 or select a value from the pump.

Example: Set watchdog triggering time to 30s Transmit Message:

01 10 00 10 00 01 02 00 1E 24 C8

Where:

01 is the slave address.

10 is the function used. Write Multiple Registers.

00 10 is the address of the holding register to be written.

00 01 is the number of registers to be written, 1 in this case.

02 is the number of bytes to be sent

00 1E is the value to be sent, 30 in decimal.

24 C8 is the CRC.

Now, the watchdog_time is set to 30s. Therefore, whenever two properly constructed messages are read in less

than 30s, including those not specifically addressed to the pump, the watchdog is reset.

6CONTROLLING THE PUMP

6.1 SET-POINT SETTING

The active set-point is selected using holding register (0x23 Set-Point pH - 0x24 Set-Point ORP). Any value outside the

acceptable range is not applied and the exception code 0x03 (illegal data value) will be answered to the command.

7MONITORING PUMP STATUS

7.1 READING PUMP MODE

The current pump mode is indicated using two bits in input register 0x00, bits 1 and 3. In combination, they specify the

mode. The following table defines the combinations and their meaning.

Bit 9

Bit 8

Meaning

Normal operating mode

Calibration mode

Programming mode

Logging mode

7.2 READING PUMP MEASUREMENTS

The Control Basic Plus pump provides three measurements of its parameters.

Parameters

Input registrer

Temperature

0x08

0x0A

ORP (RX)

0x0F

0000138174 rev.1.1 7

7.3 READING OTHER PUMP STATUS INFORMATION

There are a number of other pieces of status information. They are summarised in the following table.

Input

Bit Position

Function

0x00

pH mode

0x00

ORP (RX) mode

8WARNINGS AND ALARMS

The pump will detect and provide alarms for the following reasons:

1. Low level chemical product. Displayed on LCD as “Level”

2. OFA alarm (time>70%). Displayed on LCD as “OFA Alarm”

3. OFA alarm (time=100%). Displayed on LCD as “OFA Stop”

4. Flow rate alarm. Displayed on LCD as "Flow"

5. System error. Displayed on LCD as “Parameter error”

6. Communication Watchdog alarm. Displayed on LCD as “Alarm WDG"

The pump makes the current status of each of these available, as well as providing a limited set of historical data.

8.1 READING CURRENT WARNING/ALARM STATUS

Each of these is also accessible in input register 0x01.

Bit Position

Purpose

Indicates an alarm stsuts.

Indicates pH OFA alarm.

Indicates Rx (ORP)OFA alarm.

Indicates the low level alarm.

Indicates the flow alarm.

Indicates the communication watchdog alarm.

8.2 READING HISTORICAL ALARM DATA

When a warning or fault happens, this event will be recorded in historical alarms. In some cases when the situation still

allows the pump to run. In some situations, the pump will stop and gives a fault.

It is possible to check which alarms have been activated since the last alarm reset.

Each of these is also accessible in holding register 0x20

Bit Position

Purpose

Indicates an alarm status.

Indicates pH OFA alarm.

Indicates Rx (ORP)OFA alarm.

Indicates the low level alarm.

Indicates the flow alarm.

Indicates the communication watchdog alarm.

0000138174 rev.1.1 8

9BASIC MODBUS-RTU REGISTER MAP

The table shown in this chapter is our exclusive and original register map with the name, function and address of all

registers.

Name

Holding Registers

Input

Registers

Description

ID_Address (*only read)

0x00

Slave Address (Default: 0x01)

COM_Setup (*only read)

COM CONFIGURATION

High Byte

(will be always filled, even if is the same

configuration indicated in the Low Byte)

bits 9…8 Stop bit

High Byte

bits 9…8 Stop bit

01: 1

bits 11…10 Parity bit

01: None

10: Even

11: Odd

bits 15…12 Bauds

000: 2400

001: 4800

010: 9600

Low byte

bits 2…0 standard settings

000: 9600, 8, E, 1 (default)

001: 19200, 8, E, 1

010: 9600, 8, N, 2

011: 19200, 8, N, 2

100: 9600, 8, N, 1

101: 19200, 8, N, 1

11111111: OTHER (See High Byte)

ID_Manufacturer_hi (*only read)

0x02

0x3B8B

ID_Manufacturer_lo (*only read)

0x03

0xA51F

ID_Product_code_hi (*only

read)

0x04

0x008

ID_Product_code_lo (*only

read)

0x05

0x131E

ID_Verify

0x06

ID_Verif =

ID_manufacturer_M

SB XOR

ID_manufacturer_LS

XOR

ID_product_code_M

SB XOR

ID_product_code_LS

B XOR 0xF00A

HW_Version (*only read)

0x07

ALWAYS KEPT TO ZERO

SW_Version (*only read)

0x08

210

Watchdog_time

0x10

Time in seconds(default 0 = disabled)

Watchdog_config

0x11

0x00 - HW Reset

0x01 - RS485 Communication Reset

0x02 - Stops All Dosages and Issue an

alarm (ala)

0x03 - Issue an alarm (alarm relay)

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