I/O Expansion With The Im - Siemens simatic c7-621 Hardware Installation Manual

Installing and Preparing the C7
2.9

I/O Expansion with the IM 621

Additional S7-300
You can connect further S7-300 I/Os to the C7 via the P bus connector of the
Modules
C7-621 or C7-621 AS-i.
How you install the S7 modules, is described in the manual /71/.
Note
You can connect a maximum of four I/O modules to the C7.
Requirements
The S7-300 system must have an IM 621 interface module.
Connecting the Connect the additional I/Os as following:
Additional I/Os
1. Install the additional I/O modules as described for the rack in the
2. Connect the C7-621 or C7-621 AS-i to the IM 621 interface module via
The first time you start up the C7, it detects the connected additional
modules.
Addresses
Addressing on the C7 is described in Volume 2 Chapter 4.
P Bus Interface The C7 has an integrated P bus interface for I/O expansions with external
S7-300 standard I/Os.
2-18
manual /70/.
an IM 621 standard cable (for the connection to C7, see also Figure 2-9).
An IM 621 cable is supplied with the module and is connected to the IM
621 interface module.
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C621-01