Siemens Simatic WF-470 Video Display Module (Old)

Hello!
I need help with automation modernization project. Old automation process control system uses Siemens Simatic S 115U CPU 943,
that is ok.
But do you have any infomation of Siemens WF-470 video display system? Its about 15 years old. How WF-470 and CPU 115U conversates together?
How this old model WF-470 video processor sends and gets data from S5 CPU 115 Data Block and Data Words?
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Jukka



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http://www.mrcontrol.fsnet.co.uk/siemens.htm
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Thanks!
--
Jukka



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