4 - 24 VM600 MPS hardware manual (standard version) MAMPS-HW/E
Edition 17 - February 2018
System self-checks
MPC4 / IOC4T CARD PAIR
In practice, it can take up to 350 ms (“confirmation time” + “response time”) after an input
signal goes outside the configured OK levels before it is confirmed and acted upon in a
VM600 system as an OK System failure.
When there is an OK System failure on an MPC4 card:
• For the channel in question, the corresponding status indicator (LED) on the panel of the
card blinks green and an OK level alarm (corresponding to the individual Sensor OK bit)
is signalled.
• For the card in question, a common OK level alarm (corresponding to the common
Sensor OK bit) is signalled.
For example, these can be used to switch a relay on the IOC4T or RLC16 card.
NOTE: Any alarms (A+, D+ and so on) associated with the corresponding monitoring
channel are not inhibited, but remain active.
Most types of monitoring can be performed, however, for passive sensors providing a
voltage-based output (such as velocimeters), only open circuits can be monitored.
4.7.2 Built-in test equipment (BITE)
The MPC4 features built-in test equipment (BITE) which provides information about the
operational state of the system:
1- Continuous checks (watchdog)
A software watchdog informs the CPUM (if installed in rack) that the MPC4 card is halted.
2- Power-up test
The MPC4 hardware (such as the memory and timers) is tested on power-up. Any failure
will cause the MPC4 to be halted.
4.7.3 Overload checking
Overload protection is provided for each channel. Errors are flagged and can be read using
the VM600 MPSx software.
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