SM 338 POS Input M odule problem.

Ifthe Channel is disabled, the SF is off.
2. The Clock (+) and Clock (-) of the module is supposed to give the Clock pulses to the encoder.
The encoder supplies back the Data in Binary/Gray format at Data (+) and Data (-)to the module.
3. When i Monitored through an oscilloscope at Clock (+) and Clock (-), I was not able to get any wave form and the SF was still lit up.

Queries:-

1. Why am I not able to get the clock pulses at the module?
2. Why is the SF Lit up always??Is there any parameterization fault at the Project attached??
3. What is the CPU required for SM 338?? I have CPU 313C-2DP.
4.Since SF is always lit up, can it be a module Problem??

I have attached the project, P&F Encoder data and the connection between them in the excel sheet.

Please refer them.
Your suggestions could improve the situation.

Thank you,
Vishnu Karthik

Have you checked the diagnostic buffer?