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11.1
In this Chapter .................................................................................................11-1
11.2
Overview: Testing functions ............................................................................11-1
11.3
Overview: Diagnostics .....................................................................................11-4
11.4
Diagnostic options with STEP 7 ......................................................................11-6
11.5
Diagnostics with LEDs.....................................................................................11-7
11.6
Diagnostics of DP CPUs ...............................................................................11-12
11.6.1
Diagnostics of DP CPUs operating as DP master ........................................11-12
11.6.2
11.6.3
11.6.4
Structure of the slave diagnostic data when the CPU is used as an
intelligent slave ..............................................................................................11-22
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12.1
Assembly .........................................................................................................12-1
12.1.1
12.2
Protection against electromagnetic interference .............................................12-3
12.2.1
Basic Points for System Installations Conforming with EMC Requirements...12-3
12.2.2
Five Basic Rules for Ensuring EMC ................................................................12-5
12.2.3
EMC Compatible Installation of PLC ...............................................................12-7
12.2.4
Examples of an EMC Compatible Installation .................................................12-8
12.2.5
Shielding of Cables .......................................................................................12-11
12.2.6
Equipotential bonding....................................................................................12-12
12.2.7
Cable Routing inside Buildings......................................................................12-14
12.2.8
Outdoor cable routing ....................................................................................12-16
12.3
12.3.1
In the following sections ... ............................................................................12-17
12.3.2
12.3.3
Rules for the Transition Point between Lightning Protection
Zones 0 <-> 1 ................................................................................................12-19
12.3.4
Rules for the Transition Points between Lightning Protection
Zones 1 <-> 2 and Higher .............................................................................12-21
12.3.5
Sample of a Surge Protection Circuit for Networked S7-300 PLCs ..............12-24
12.3.6
1 How to Protect Digital Output Modules against Inductive Surge Voltage ..12-26
12.4
Safety of electronic control equipment ..........................................................12-28
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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
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