User guide

Installation Instructions
Isolated-Circuit
Discrete Input and Output Modules
7
1746sc-IB8I Specifications
Number of Inputs 8, sink or source
Points per Common 1 (individually isolated)
Voltage Category 24 Vdc
Operating Voltage ±11.5 to 32 Vdc
Nominal Input Current 12 mA @ 24 Vdc
Input Signal Delay (maximum)
Off to On 0.5 ms @ 24 Vac
On to Off 1 ms @ 24 Vac
Off-State Current (maximum) 1.8 mA @ 4.5 Vac
➀
Power Dissipation (maximum) 6.6 W @ 240 Vac/dc
Watts per point
➁
0.4 W @ 24 Vdc; 0.6 W @ 32 Vdc
Total Watts
➂
3 W @ 24 Vdc; 4.8 W @ 32 Vdc
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 1input turned on.
➂
Maximum with all 8 inputs turned on (100% duty cycle).
1746sc-IB8I On-Off-State Voltage Range
0 Vdc 4.5 Vdc 11.5 Vdc 32 Vdc
Off-State Input State Not Guaranteed On-State
1746sc-IB8I Circuit Diagram (one circuit shown)
IN –
VDC +
1.91 Ω
1.91 kΩ
3.16 kΩ