4 - 22 VM600 MPS hardware manual (standard version) MAMPS-HW/E
Edition 17 - February 2018
Alarm monitoring
MPC4 / IOC4T CARD PAIR
NOTE: The MPS1 and MPS2 software packages use the SBP (sensor bypassed) flag
to refer to the channel inhibit function.
• Any processing channels that depend on the channel are automatically bypassed.
For example, if a speed channel is inhibited, any processing that uses the speed channel
as an input will also be inhibited, in addition to the speed processing itself.
• The measurement channel’s status indicator (LED) on the panel of the MPC4 card slowly
blinks green for the duration of the channel inhibit (approximately once per second).
NOTE: For a speed channel, the channel inhibit function affects “local” speed signals only.
When channel inhibit is used with a “local” speed signal, the speed signal is still
shared remotely using the Tacho Bus, if configured (see 3.4.2 Tacho Bus).
The channel inhibit function cannot be used with “remote” speed signals, that is,
“remote” speed signals cannot be temporarily bypassed using the channel inhibit
function.
When the channel inhibit function is de-activated for an MPC4 channel, the card:
• Waits 2 seconds for signal stabilisation, in addition to the OK system check recovery
time. This gives a total recovery time of 2.1 seconds for MPC4 cards running firmware
version 070 or earlier and of 12 seconds for MPC4 cards running firmware version 071
or later.(see 4.7.1 OK system checking and Figure 4-10).
• Resets (clears) any latched alarms.
• Stops forcing the flags for the channel processing to a normal state, so that the true
status of the machinery monitoring system is returned again. The sensor bypassed
(SBP) flag is also set inactive (=0).
• The channel’s status indicator (LED) on the panel of the MPC4 card indicates the
operational status of the card.
NOTE: When an MPC4 card is configured (using the VM600 MPS software), the channel
inhibit function is automatically de-activated for any channels where it is active.
The status of the channel inhibit function for the individual channels of an MPC4 card can be
used as an input to a basic function (see 4.6.2 Logical combinations of alarms).
See also 4.6.5 Danger Bypass function and 9.8 Channel inhibit function.
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