User guide

Installation Instructions
Isolated-Circuit
Discrete Input and Output Modules
6
1746sc-IA8I Specifications
Number of Inputs 8
Points per Common 1 (individually isolated)
Voltage Category 100/120 Vac @ 50/60 Hz
100/120 Vdc, sink or source
Operating Voltage 80 to 150 Vac @ 47 to 63 Hz
85 to 170 Vdc
Nominal Input Current 16 mA @ 120 Vac, 60 Hz
2.5 mA @ 120 Vdc
Input Inrush Current (maximum) 0.7 A @ 120 Vac
Input Signal Delay (maximum)
Off to On 17 ms @ 120 Vac
7 ms @ 120 Vdc
On to Off 45 ms @ 120 Vac
40 ms @ 120 Vdc
Off-State Current (maximum) 4 mA @ 20 Vac
➀
0.5 mA @ 20 Vdc
Power Dissipation (maximum)
Watts per point
➁
0.5 W @ 120 Vac/dc; 0.75 W @ 150 Vac/dc
Total watts
➂
4 W @ 120 Vac/dc; 6 W @ 150 Vac/dc
Backplane CurrentDraw (max.) 5 V 0.110 A
24 V 0.0 A
➀
Maximum allowable leakage current from an input device in an off state.
➁
Maximum with 1 input turned on.
➂
Maximum with all 8 inputs turned on (100% duty cycle).
1746sc-IA8I On/Off-State Voltage Range
0 Vac*
0 Vdc
30 Vac*
20 Vdc
80 Vac*
85 Vdc
150 Vac*
170 Vdc
Off-State Input State Not Guaranteed On-State
* Frequency = 47 to 63 Hz
1746sc-IA8I Circuit Diagram (one circuit shown)
IN –
VAC/VDC +
249 Ω
24.3 kΩ
24.3 kΩ
0.33 µF