Siemens Simatic M7-400 Reference Manual page 552

Interface Submodules
13.8 IF 961-CT1 Interface Submodule for M7-300/400;
(6ES7961-3AA00-0AC0)
Characteristics
The IF 961-CT1 interface submodule is used for connecting incremental encoders.
It has the following characteristics:
• Connection with RS422 or 24 V signals
• 4 digital inputs (START, STOP, SET, RESET), isolated
• 2 digital outputs (Q1, Q2), isolated
Figure 13-24 IF 961-CT1 Interface Submodule
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S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07