Wiring
You can wire each IDNet output from the sprinkler card, or IDNet Loop Card as either an isolated Class A circuit, or as two isolated Class B circuits.
Class A / DCLA wiring provides an alternate communication path that maintains communication to all devices when a single open circuit fault occurs.
Class A wiring requires two wires routed from the primary terminals (B+, B-) to each device, and then back to the secondary terminals (A+, A-). The
wiring is in/out. T-tapping is not permitted.
Class B / DCLB wiring permits T-tapping. IDNet wiring is inherently supervised due to individual device level communications. End-of-line resistors are
not required.
Ferrite beads
You need to use ferrite beads for field wiring.
1. Install a ferrite bead close to any IDNet field wiring terminals in use (terminals B+/B-, terminals A+/A-) for lowest radiated emissions. Install the
ferrite bead before wires leave the enclosure.
2. Loop both wires (+/-) through the bead as shown in Figure 9.
Figure 9: Ferrite bead installation
Wiring parameters
Table 2 identifies the card wiring parameters that you must consider when installing these cards.
Table 2: Card wiring parameters
Wiring capacitance parameters
Parameter Value
Maximum supported channel capacitance: total of all four
isolated outputs.
The sum of line-to-line capacitance, plus the capacitance of either line-to-shield
(if shield is present) = 0.6 μF (600 nF).
Capacitance between IDNet SLC wiring between wires of the same
polarity: plus to plus, minus to minus.
1 μF maximum (this is for multiple IDNet loops).
Wiring distance limits, see the note below.
Class B wiring, total channel wiring parameters,
including T-Taps
Class A wiring, total channel wiring parametersChannel loading
Up to 125 devices 126 to 250
devices
Up to 125 devices 126 to 250
devices
Total loop resistance 50 Ω maximum 35 Ω maximum 50 Ω maximum 35 Ω maximum
18 AWG (0.82 mm2) 4000 ft (1219 m)
per run, 12,500 ft (3810 m)
total
2500 ft (762 m) per
run, 10,000 ft
(3048 m) total
4000 ft (1219 m)
per loop, 12,500 ft (3810
m) total
2500 ft (762 m)
per loop, 10,000
ft (3048 m) total
16 AWG (1.31 mm2)
14 AWG (2.08 mm2)
12 AWG (3.31mm2)
5000 ft (1524 m)
per run, 12,500 ft (3810 m)
total
2500 ft (762 m) per
run, 10,000 ft
(3048 m) total
5000 ft (1524 m)
per loop, 12,500 ft (3810
m) total
2500 ft (762 m)
per loop, 10,000 ft (3048
m) total
Note: The maximum wiring distance is determined by either reaching the maximum resistance, the maximum capacitance, or the stated maximum
distance, whichever occurs first. Class A maximum distances are to the farthest device on the loop from either B or A terminals. For Class B wiring, the
maximum distance to the farthest device is limited to the stated Class A wiring distances.
Note: External wiring must be shielded for lightning suppression, and 2081-9044 Overvoltage Protectors
must be installed at building exit and entrance locations.
Capacitance: Each protector adds 0.006 μF across the connected line.
Resistance: Each protector adds 3 Ω per line of series resistance: both IDNet lines are protected, 6 Ω per
protector will be added to total loop resistance.
Maximum distance of a single protected wiring run is 3270 ft (1 km).
Wiring considerations using the
2081-9044 Overvoltage Protectors.
2081-9044 is UL listed to Standard
1459, standard for telephone
equipment.
For additional information, refer to 2081-9044 Overvoltage Protector Installation Instructions, 574-832.
page 6 579-1214AR Rev. B
4100-3113AR IDNet 2 Sprinkler Card, and 4100-3111 IDNet Loop Card Installation Instructions
