First Power-On Of The Cpus; Cpu Pairing - Siemens SIMATIC S7-1500 System Manual

Commissioning
11.3 Commissioning procedure
11.3.2

First power-on of the CPUs

Requirements
• The SIMATIC S7-1500R/H redundant system has been installed.
• The system has been wired.
• The SIMATIC memory cards are in the CPUs.
Procedure
Proceed as follows to commission the CPUs:
1. Turn on the load current supply.
Result:
• The CPUs run an LED test. All LEDs flash at 2 Hz,
– the RUN/STOP LED flashes alternately yellow/green
– the ERROR-LED red
– the MAINT LED yellow.
• The CPUs run system initialization and evaluate the SIMATIC memory cards:
– The RUN/STOP LED flashes yellow at 2 Hz.
• When system initialization is complete, the CPUs switch to STOP:
– The RUN/STOP LED lights up in yellow.
11.3.3

CPU pairing

Introduction
Pairing is the mutual recognition of the two CPUs within a network. During pairing, the CPUs
exchange information for mutual identification. Example: Checking for matching article
number and firmware version.
Successful pairing of two CPUs is a fundamental requirement for redundant operation.
Requirement
For successful pairing, the CPUs must have the same firmware version and the same or
compatible article numbers.
An invalid configuration variant prevents the pairing of two CPUs, for example more than two
R-CPUs in the PROFINET ring. Pairing errors are reported in the diagnostics buffer.
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S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD