WF 705 in S7

Hi everbody

I have one WF 705 (SSI position card) . In my understans (from manual of this card) This card also suitable for S7 system. But i can`t find standart FC for WF705 for Step7. Can somebody help me? 

Hello s_erel;

For th first few years after the introduction of the S7 CPUs, Siemens offered a special adapter casing that could hold 2 S5 intelligent modules (in S7 speak, FMs) in a S7 rack.

Wen you purchased this adapter Siemens sent you the converted FBs required to operate these modules in a S7 environment. By the way, the adapter casing is no longer available in S7-400 catalogs, nor are the converted FBs.  

See the screenshot below, taken from this manual:

From S5 to S7 Converter Manual

This was the only option to integrate physically these S5 modules in a S7-400 rack (and only in that family of processors). See for example this list of available S5 IP modules with their converted FBs:

IPs With Adapter Casing Now Also for Use in S7-400 PLCs

This manual could also be interesting: it discusses the installation of the WF 705 in a S7 rack and the programming under Step 7:

Equipment for Special Machines WF 705 Position Measuring Module

However, note that in the screenshot alternative part numbers are given, for modules with similar functionalities in the standard S7-400 modules. In this case the WF 705 could be replaced with a FM 451.

If you would like to mention the S7 family and software you intend to work with, we might be able to propose a replacement module that would give you similar functions as the WF 705, or very close. This would also be a cheaper alternative.

Hope this helps,

Daniel Chartier