Siemens SIMATIC S5 Manual page 125

Data Exchange with the Central Controller
Assignment of the bits in the controllers:
Byte 6/7 Approach phase
If a hot channel controller is in the approach phase, the bit belonging to the
controller is set (see Section 3.1.2).
Assignment of the bits in the controllers:
The corresponding bit is 0 if:
– setpoint = 0 or
– heating switch off and effective for this controller
Byte 8 Free
to 13
Byte 14 This byte contains the two last numbers of the MLFB number:
– for variant -3AA22:
– for variant -3AB31:
Byte 15 This byte contains the software release entered in the EPROM.
4–58
22
31
IP244
C79000–B8576–C860–02