Siemens SIPLUS HCS Operating Instructions Manual page 105

POM:
In a firmware update, new firmware is downloaded to all power output modules (POMs)
operated on a Central Interface Module (CIM).
After the update, the HCS4300 restarts automatically. Only in the event of a fault when the
update has not been correctly completed do you have to restart the HCS4300.
I/O module PM:
In the event of a firmware update, new firmware is loaded into the inserted PM. After the
update, the HCS4300 restarts automatically. Only in the event of a fault, if the update has
not been correctly completed, is it necessary to restart the HCS4300.
SIPLUS HCS4300
Operating Instructions, 11/2015, A5E35452705A/002
Service and maintenance
12.2 Firmware update
105