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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
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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 Reading slave diagnostic data ......................................................................11-15
11.6.3 Interrupts on the DP Master ..........................................................................11-21
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 General Rules and Regulations for S7-300 Operation....................................12-1
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 .................................................12-9
12.2.5 Shielding of Cables .......................................................................................12-12
12.2.6 Equipotential bonding....................................................................................12-13
12.2.7 Cable Routing inside Buildings......................................................................12-15
12.2.8 Outdoor cable routing....................................................................................12-17
12.3 Lightning and Surge Voltage Protection........................................................12-18
12.3.1 In the following sections ... ............................................................................12-18
12.3.2 Lightning Protection Zone Concept...............................................................12-18
12.3.3 Rules for the Transition Point between Lightning Protection
Zones 0 <-> 1 ................................................................................................12-20
12.3.4 Rules for the Transition Points between Lightning Protection
Zones 1 <-> 2 and Higher .............................................................................12-22
12.3.5 Sample of a Surge Protection Circuit for Networked S7-300 PLCs..............12-25
12.3.6 1 How to Protect Digital Output Modules against Inductive Surge Voltage ..12-27
12.4 Safety of electronic control equipment ..........................................................12-29
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