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Why won't the S811+ I replaced for an S801+ start?

The S811+ has an identical  structure of the S801+ with a small difference in the local control (terminal block). This is also true with S811 and S801 units.

Looking at the control wiring in the S811+ (S811) user manual we note that a +24 Vdc signal is required for the S811+ to recognize a RUN command from the terminal block (terminals "P" and "1"). The S801+ (S801) units have a different function on this terminal and do not require ths jumper to be installed. 

 

NOTE: The Local Ctrl Only parameter located in the Advanced I/O Menu of the S811+ will accomplish the same functionality that will cause the S811+ not to require the jumper at terminal #3.