SKF Multilog On-Line System IMx-M
2 - 1
User Manual
2
Protection
Safety Considerations
The following are some of the PRM safety related issues that should be considered.
Table 2-1: PRM related safety considerations.
Cause
Effect
PRM firmware is being updated
Protection functionality of PRM slot is not active and all relays go to non
energized state.
PRM configuration is being
updated
Protection functionality of PRM slot is not active and all relays go to non
energized state.
Updating CMM FW through the
Observer database distribution
(automated)
Rack signaling CF (circuit fault) = Rack not trustable unless Modbus is used to
verify channel status registers and the register System Status 1.
Updating the CMM firmware
directly on the rack by using the
IMx-M Manager (USB)
PRM slot signaling CF = PRM slot not trustable unless Modbus is used to verify
channel status registers and the register System Status 1.
Entering Maintenance mode
Protection functionality of PRM slot is not active because PRM slot has to be
disarmed to enter the maintenance mode.
Updating Observer software
(uninstall old version and install
new version, put new firmware in
DB, etc.)
Rack signaling CF = Rack not trustable unless Modbus is used to verify channel
status registers and the register System Status 1.
Change or update CMM settings
or configuration via Observer
Rack signaling CF = Rack not trustable unless Modbus is used to verify channel
status registers and the register System Status 1.
Because CMM is rebooting, PRM cannot store safety events and will be
signaling circuit fault.
Change or update CMM settings
or configuration via IMx-M
Manager (USB)
PRM Slot signaling CF = PRM slot not trustable unless Modbus is used to
verify channel status registers and the register System Status 1.
Because CMM is rebooting, PRM cannot store safety events and will be
signaling circuit fault.
Disarm (slot or rack)
Protection functionality of PRM slot is not active, refer
Hot-swap of any module in the
rack
Protection functionality of Rack is not active because the rack (all slots) shall
be in disarm mode during a properly performed hot-swap procedure.