Siemens SIMATIC S5 Manual page 240

Notes on heating current monitoring
When operating the module with heating current monitoring, the following points should be noted:
– a maximum of 6 controllers with heating current monitoring are possible,
– the heating currents for each channel are monitored when the monitoring is selected and the
hardware is available (channels 6 to 11),
– the power supply voltage is measured via channel 13.
This results in a different assignment in some of the messages when heating current monitoring
is required:
The assignment in messages 0 to 5 remains unchanged.
The assignment in messages 6 to 11 of data block DB-A for heating current monitoring
Changes in data words DWn to DWn + 6 are transferred with the command AS.
*) The message number (data byte DR n + 15) must be entered in the data block by the user
IP244
C79000–B8576–C861–02
Function
5–35