Configuration, Programming And Diagnostics - Siemens SIMATIC S7-400H System Manual

Migrating from S5-H to S7-400H
C.2 Configuration, programming and diagnostics
C.2 Configuration, programming and diagnostics
Configuration
Configuration was performed in STEP 5 using a dedicated configuration package, such as
COM 155H.
In STEP 7, the fault-tolerant CPUs are configured using the base software. In SIMATIC Manager,
you can create a fault-tolerant station and configure it in HW CONFIG. The special features
of the redundant CPUs are grouped on a small number of tabs. Integration into networks and
configuration of connections is handled with NetPro.
Diagnostics and programming
In S5, error diagnostics are implemented with the help of the error data block to which the
system writes all error data. Error OB 37 is started automatically when any entries are made.
Further information has been stored in the H memory word.
The H memory word consists of a status byte and a control byte. Control information can be
set in a bit pattern in the STEP 5 user program.
In STEP 7, system diagnostics is accomplished by means of the diagnostics buffer or by
displaying what are known as partial lists from the system status list (specific information for
fault-tolerant systems, for example, is located in SSL71). This query can be performed with
the help of the PG or in the user program with SFC 51 "RDSYSST".
OB 70 is available for I/O redundancy loss, and OB 72 for CPU redundancy loss.
The function of the control byte is implemented in STEP 7 by means of SFC 90 "H_CTRL".
Error OB 37
Memory control word
Memory status word
Error block
328
Topic in S5 Equivalent in S7
Error OBs OB 70 and OB 72
SFC 90 "H_CTRL"
SSL71
Diagnostics buffer
System Manual, 09/2007, A5E00267695-03
S7-400H