Document reference MAMPS-HW/E HARDWARE MANUAL
Edition 18 - March 2022 VM600 machinery protection system (MPS)
5-9
Alarm monitoring
AMC8 / IOC8T CARD PAIR
In the example given in Figure 5-4:
Advanced Function 1 = Basic Function 1 OR Basic Function 2
= ( Channel 5 Alert− AND Channel 6 Alert− )
OR
( Multi-Channel 1 Alert+ AND Channel 4 Alert+ )
Note that the use of advanced logic functions is equivalent to placing brackets in the equation
above.
Advanced Function 2 =
“Any 2 or more of 3” ( Basic Function 1 ; Basic Function 2 ; Basic Function 3 )
5.8.3 Danger Bypass function
This function allows Danger relays to be inhibited, even when a Danger condition occurs. The
Danger information remains available to the MPS, but the Danger relays are de-activated to
prevent the monitored machine from being shut down.
The Danger conditions inhibited are the following individual alarms:
• The Danger+ and Danger− generated by the eight individual measurement channels.
• The Danger+ and Danger− generated by the four multi-channel measurement channels.
The outputs of any logic functions using these Danger conditions as inputs will be affected by
the use of the Danger Bypass function as the individual alarms are set to inactive for the
duration of a Danger Bypass.
The Danger Bypass function is activated when a low (0 V) external signal is applied to the
Danger Bypass input on the IOC8T card.
See also 5.8.4 Channel inhibit function.
Figure 5-4: Example showing basic and advanced logic functions, as well as
“multi-channel” usage
Basic
Function 1
Advanced
Function 1
Chan 5
Alert−
Chan 6
Alert−
Chan 1
Chan 2
Chan 3
Chan 4
Alert+
Chan 7
Danger+
AND
AVG
Multi-
Channel 1
AND
OR
NEG
Voting
logic:
≥2 of 3
Basic
Function 2
Advanced
Function 2
Basic
Function 3
Alert+
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