GE VersaMax IC200PWR001 User Manual page 202

7
IC200MDL643
Input Module, 5/12 V DC Pos/Neg Logic Grouped 16 Points
Wiring for TTL Inputs
To be compatible with TTL outputs, the negative logic configuration should be
used as follows.
+5V
User
Circuit
Common x
TTL IC
Output
Input x
GFK-1504N Chapter 7 Discrete Input Modules 7-49