Vibro-Meter ABE042  6U 19-inch rack (4 slots)

ABE042  6U 19-inch rack (4 slots)

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, Channel1 to Channel8)

• Alert+, Alert−, Danger+, Danger− generated by any of the four “multi-channels”

(that is, Multi-Channel1 to Multi-Channel4)

• 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 4.6.2.1Basic functions.

This is illustrated in the example given in Figure5-4. In this example:

BasicFunction1 = Channel5Alert− AND Channel6Alert−

BasicFunction2= Multi-Channel1Alert+ AND Channel4Alert+

In this example, Multi-Channel 1 is obtained from calculating the

Averageof ( Channel1. Channel2 and Channel3 ).

BasicFunction3= NegationofChannel7Danger+

(also known as NOTChannel7Danger+)

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)

In the example given in Figure5-4:

AdvancedFunction1 = BasicFunction1 OR BasicFunction2

= (Channel5Alert− AND Channel6Alert−)

OR

( Multi-Channel1Alert+ AND Channel4Alert+ )

Note that the use of advanced logic functions is equivalent to placing brackets in the equation

above.

AdvancedFunction2 =

“Any 2 or more of 3” ( BasicFunction1 ; BasicFunction2 ; BasicFunction3 )

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 (0V) external signal is applied to the

Danger Bypass input on the IOC8T card