Contents
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
vii
8-11 Direct Data Exchange with CPUs 31x-2 DP/31xC-2 DP.................................8-35
9-1 Unlocking the front connector and removing the module .................................9-6
9-2 Removing the front connector coding pin .........................................................9-7
9-3 Installing a new module.....................................................................................9-7
9-4 Inserting the front connector .............................................................................9-8
9-5 Replacing the backup battery in CPU 313/314.................................................9-9
9-6 Location of fuses in the digital output module 120/230 VAC ..........................9-12
10-1 Principle of Forcing with S7-300 CPUs (all CPUs except 318-2 DP) .............10-3
10-2 Status and error displays of 31xC CPUs ........................................................10-7
10-3 Diagnostics with CPU 31x-2 (315-2-DP as of 315-2AF03)...........................10-12
10-4 Diagnostic addresses for DP masters and DP slaves ..................................10-13
10-5 Diagnostic address for the receiving station with direct data exchange.......10-15
10-6 Diagnostic addresses for DP masters and DP slaves ..................................10-19
10-7 Structure of slave diagnostic data.................................................................10-22
10-8 Structure of module diagnostics of CPU 31x-2.............................................10-25
10-9 Structure of the module status ......................................................................10-26
10-10 Structure of the interrupt status for CPU 31xC .............................................10-27
10-11 Byte y+4 to y+7 for Diagnostic/Process interrupts........................................10-28
11-1 Possible paths of electromagnetic interference ..............................................11-3
11-2 Example of an EMC compatible cabinet installation.......................................11-9
11-3 Example of EMC compatible wall-mounting .................................................11-11
11-4 Mounting cable shielding...............................................................................11-13
11-5 Equipotential bonding....................................................................................11-14
11-6 Lightning protection zones of a building........................................................11-20
11-7 Sample circuitry for networked S7-300 PLCs ...............................................11-26
11-8 EMERGENCY-OFF relay contact in the output circuit..................................11-28
11-9 Circuit for coils operated with DC voltage.....................................................11-29
11-10 Circuit for coils operated with AC voltage .....................................................11-29
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