HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
5-8
Alarm monitoring
AMC8 / IOC8T CARD PAIR
5.8.2 Logical combinations of alarms
The MPS allows logical combinations of alarms to be configured under software control.
NOTE: Refer to the relevant manual for further information: VM600 MPS1 software
manual or VM600 MPS2 software manual.
Two types of alarm combination functions exist:
• Basic functions
• Advanced functions.
Both types of logically combined alarms can be used to set relays.
5.8.2.1 Basic functions
Up to 16 basic logic functions can be programmed. Each basic logic function can act on two
or more of the following individual alarms:
• Alert+, Alert−, Danger+, Danger− generated by any of the eight single channels
(that is, Channel 1 to Channel 8)
• Alert+, Alert−, Danger+, Danger− generated by any of the four “multi-channels”
(that is, Multi-Channel 1 to Multi-Channel 4)
• Global Channel OK failure
• Various hardware-related and software-related alarms and statuses (for example, AMC
Configuration Not Running, Status Latched, Danger Bypass, Alarm Reset).
The following logic operations can be applied:
•AND
•OR
• Voting logic, for example, any 3 (or more) out of 9 possible alarms.
NOTE: The voting logic operation for the AMC8 is different to that for the MPC4. The
AMC8 uses “more than or equal to x” and the MPC4 uses “more than x”.
Compare with 4.6.2.1 Basic functions.
This is illustrated in the example given in Figure 5-4. In this example:
Basic Function 1 = Channel 5 Alert− AND Channel 6 Alert−
Basic Function 2 = Multi-Channel 1 Alert+ AND Channel 4 Alert+
In this example, Multi-Channel 1 is obtained from calculating the
Average of ( Channel 1, Channel 2 and Channel 3 ).
Basic Function 3 = Negation of Channel 7 Danger+
(also known as NOT Channel 7 Danger+)
5.8.2.2 Advanced functions
Up to 8 advanced logic functions can be programmed. Each advanced logic function can act
on two or more of the 16 basic logic functions described above.
The following logic operations can be applied:
•AND
•OR
• Voting logic (for example, any 2 of 3).
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