Siemens Simatic S7-400 - Manual (Page 557)

Interface Submodules
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S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
13.9 IF 964-DP Interface Submodule for S7-400 and M7-400
Order Numbers
You can use the IF 964-DP interface submodule with order number
6ES7964-2AA00-0AB0 (up to 07/99) in the M7-400.
You can use the IF 964-DP interface submodule with order number
6ES7964-2AA01-0AB0 (as of 07/99) in the S7-400 and in the M7-400.
Characteristics
The IF 964-DP interface submodule is used for connecting distributed I/O via
“PROFIBUS DP”. The submodule has an isolated RS485 interface. The maximum
transmission rate is 12 Mbps.
The permissible cable length depends on the transmission rate and the number of
nodes. In the case of a point-to-point connection with a speed of 12 Mbps, a cable
length of 100 m is possible, and with a speed of 9.6 Kbps a cable length of 1,200 m
is possible.
The system can be expanded to 125 stations.
Figure 13-25 IF 964-DP Interface Submodule