Rules For Fitting A Fault-Tolerant Station; Creating A Fault-Tolerant Station - Siemens SIMATIC S7-400H Manual

9.2 Configuring with STEP 7
The basic approach to configuring the S7-400H is no different from that used to
configure the S7-400 – in other words
• creating projects and stations
• configuring hardware and networking
• loading system data onto the programmable logic controller.
Even the different steps that are required for this are identical for the most part to
those with which you are familiar from the S7-400.
Notice
The following error OBs must be loaded to the CPU in the S7-400H: OB 70,
OB 72, OB 80, OB 82, OB 83, OB 85, OB 86, OB 87, OB 88, OB 121 and
OB 122. If these OBs are not loaded, the H- system goes into the STOP system
state when a fault occurs.

Creating a fault-tolerant station

The SIMATIC fault-tolerant station is offered as a separate station type by
SIMATIC Manager. It allows the configuration of two central controllers, each
having a CPU and thus the redundant fault-tolerant station configuration.
9.2.1

Rules for Fitting a Fault-Tolerant Station

The following rules have to be complied with for a fault-tolerant station, in addition
to the rules that generally apply to the arrangement of modules in the S7-400:
• The central processing units must be inserted in the same slots in each case.
• Redundantly used external DP master interfaces or communication modules
must be inserted in the same slots in each case.
• External DP master interface modules for redundant DP master systems should
only be inserted in central racks and not in expansion racks.
• Redundantly used modules (for example, CPU 417-4H, DP slave interface
module IM 153-2) must be identical – in other words, they must have the same
order number, the same version, and the same firmware version.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Configuring with STEP 7
9-3