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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x

A5E00105492-03

vii

11-1 Principle of forcing in S7-300 CPUs...........................................................11-3

11-2 Diagnostics with CPU 31x-2.....................................................................11-12

11-3 Diagnostic addresses for DP masters and DP slaves .............................11-13

11-4 Diagnostic address for the receiving station with direct data exchange ..11-15

11-5 Diagnostic addresses for DP masters and DP slaves .............................11-19

11-6 Structure of slave diagnostic data............................................................11-22

11-7 Structure of the ID-specific diagnostics for CPU 31x-2............................11-25

11-8 Structure of the module status .................................................................11-26

11-9 Structure of the interrupt status................................................................11-27

11-10 Bytes y+4 to y+7 for a diagnostic interrupt (operating status

change by intelligent slave)......................................................................11-28

11-11 Bytes y+4 to y+7 for the diagnostic interrupt (SFB 75) ............................11-29

12-1 Possible paths of electromagnetic interference .........................................12-3

12-2 Example of an EMC compatible cabinet installation ..................................12-9

12-3 Example of EMC compatible wall-mounting ............................................12-11

12-4 Mounting cable shielding..........................................................................12-13

12-5 Equipotential bonding...............................................................................12-14

12-6 Lightning protection zones of a building...................................................12-19

12-7 Sample circuit for networked S7-300 PLCs .............................................12-25

12-8 EMERGENCY-OFF relay contact in the output circuit.............................12-27

12-9 Circuit for coils operated with DC voltage ................................................12-28

12-10 Circuit for coils operated with AC voltage ................................................12-28

Siemens CPU 312 Hardware And Installation Guide

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