Determining The Status Of The Passivation; Determining The Passivation Status With The Status Byte; Assignment Of The Status Byte - Siemens SIMATIC S7-400H Manual

7.4.1

Determining the status of the passivation

Procedure
First determine the status of the passivation with the status byte in the status word
/ control word "FB_RED_IN.STATUS_CONTROL_W". If you find that a module has
been passivated, you can determine the status of this module – or the
corresponding modules pair – in the MODUL_STATUS_WORD.

Determining the passivation status with the status byte

The status word / control word "FB_RED_IN.STATUS_CONTROL_W" is located in
the instance DB of FB 450 "RED_IN". The status byte provides information about
the status of the redundant I/O.
Table 7-4
Bit
Status byte (byte 1)
0 Standby
1 Standby
2 0 = No analog output module available
1 = at least one analog output module available
3 0 = No passivation by OB 85
1 = at least one passivation by OB 85
4 0 = No passivation by OB 82
1 = at least one passivation by OB 82
5 0 = No channel information available
1 = at least channel information available
6 0 = No module passivated
1 = at least one module passivated
7 0 = Complete depassivation not running
1 = Complete depassivation running
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07

Assignment of the status byte

Using I/O on the S7-400H
Meaning
7-33