GAI-Tronics 12584-002 I/O Control Module - Manual (Page 9)

Pub. 42004-388B
Model 12584-002 I/O Control Module Page: 9 of 15
\\s_eng\gtcproddocs\standard ioms - current release\42004 instr. manuals\42004-388b.doc
04/07
TB5, TB6, TB7, and TB8 - Digital Input Connections
The TB5, TB6, TB7 and TB8 connectors each provide connections for eight contact closure inputs.
Switches or relay contact closures are used to activate the inputs. The input contacts may be any
combination of momentary (pulsed) switches and maintained (latched) switches. They can be either N.O.
or N.C. dry contacts rated at 5 mA minimum.
N OTE : For the inputs to operate reliably, the cable loop resistance connecting the relay/switch contact
closures cannot exceed 200 ohms. For example, using No. 24 AWG cable, the maximum cable length for
connection of the relay/switch contact closures cannot exceed 1,500 feet. Refer to the terminal block
assignment charts and Figure 3 below.
Figure 3. Typical input switch wiring