Specifications

5-20
SPS IDNet Wiring
,
Continued
1. The current allowance per device on the loop is 0.5mA with the LED off, 2mA with
the LED on. A maximum of 20 LEDs will be turned on at any time by the IDNet
Card, e.g. in alarm.
2. The minimum voltage allowed at the furthest device to guarantee operation is
24.9Vdc. The IDNet boosts its output voltage from 30V to 35V during alarm.
0
500
1000
1500
2000
2500
3000
3500
4000
4500
0 25 50 75 100 125 150 175 200 225 250
Number of Devices on Loop
Maximum Cable Distance (metres)
0
500
1000
1500
2000
2500
3000
3500
4000
4500
0.75 sq.mm
1.0 sq.mm
1.5 s
q
.mm
2.5 sq.mm
4.0 sq.mm
Figure 5-10. Cable Distance & Device Limits for Common Cable Sizes
Continued on next page
Notes