Installation instructions, Isolated-circuit discrete input and output modules – Spectrum Controls 1746sc-OAP8I User Manual
Page 9

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 Current Draw (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 k
Ω
3.16 k
Ω