GE VersaMax Manual page 187

7
IC200MDL643
Input Module, 5/12VDC Pos/Neg Logic Grouped 16 Points
Wiring for TTL Inputs
To be compatible with TTL outputs, the negative logic configuration should be used
as shown below.
7-48 VersaMax® Modules, Power Supplies, and Carriers User's Manual – March 2003
+5V
User
Circuit
TTL IC
Output
Common x
Input x
GFK-1504K