Siemens Simatic S7-400 - Manual (Page 486)

M7-400 Expansions
12-16
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
12.3.1 Pin Assignments of the AT Module
Pin Assignments
The ATM 478 AT adapter module has a 98-pin standard direct connector for short
AT modules (see Figure 12-8).
16 bit data
8 bit data
Figure 12-8 ATM 478 AT Adapter Module, 98-Pin Standard Direct Connector
See the following table for the pin assignments of the 98-pin standard direct
connector.