HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
4-16
Alarm monitoring
MPC4 / IOC4T CARD PAIR
4.6.2 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.
4.6.2.1 Basic functions
Up to eight 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 four individual channels
(that is, Channel 1, Channel 2, Channel 3 and Channel 4)
• Alert+, Alert−, Danger+, Danger− generated by either of the two dual channels
(that is, Channels 1 & 2 and Channels 3 & 4)
• Alert+, Alert− generated by either of the two speed channels
• The Common Alert, the Common Danger and Common OK alarms
• Various hardware and software related alarms (such as Track Lost, DSP Saturation
Error, Input Saturation Error and so on).
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 MPC4 is different to that for the AMC8. The
MPC4 uses “more than x” and the AMC8 uses “more than or equal to x”.
Compare with 5.8.2.1 Basic functions.
This is illustrated in the example given in Figure 4-7. In this example:
Basic Function 3 = Speed Ch.1 Alert+ OR Speed Ch.2 Alert+
4.6.2.2 Advanced functions
Up to four advanced logic functions can be programmed. Each advanced logic function can
act on two or more of the eight basic logic functions described above.
The following logic operations can be applied:
•AND
•OR.
In the example given in Figure 4-7:
Advanced Function 1 = Basic Function 1 OR Basic Function 2
= ( Ch.1, Out.1 Alert+ AND Ch.3, Out.1 Alert+ AND Ch.4, Out.2 Alert− )
OR
“More than 1 of 3” ( Ch.1, Out.2 Danger+ ; Ch.2, Out.2 Danger+ ;
Ch.3, Out.2 Danger− )
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