Yokogawa PC-Based MX100 - Manual (Page 45)

45
IM MX100-0E
Energized/De-energized Operation of Output Relays
You can select whether the output relay is energized or de-energized when an output
event (such as an alarm) occurs. If de-energized is selected, the output relay behaves in
the same fashion as when an output event occurs if the power is shut down. The default
setting is Energized. The FAIL output is fixed to De-energized.
NO Energize
De-energize
C NO C NO C
NO C NO C NO C
When power is
shut down
NO: Normally Opened, C: Common
When alarm is
not occurring
When alarm is
occurring
Hold/Non-Hold of Output Relays
Select the behavior of the output relay when an output event is released (recovers to a
normal condition). The default setting is Non-hold
• Turn OFF the output relay with the release of the output event (non-hold).
• Hold the output relay at ON until the
Relay ACK button (see below) is clicked.
Relay ACK button
Output cause
occurrence
• When set to non-hold • When set to hold
Relay output ON
Relay output OFF
Relay ACK
Relay output ON
Relay output OFF
Output cause
occurrence
Note
If connection with the PC is dropped, the state at the point at which the DO output was dropped
is retained. However, DO output to which measurement channel alarm detection is assigned
functions normally even if the connection with the PC is dropped.
Operations of the MX100 Standard Software