Yokogawa YVP110 - Manual (Page 38)

<5. Setup>
5-5
IM 21B04C01-01E
(4) Thresholds for Limit Switches
Just like hardware limit switches for a valve,
on/off status signals can be generated when
the valve position read-back signal FINAL_
POSITION_VALUE.value reaches specified
levels. These on/off statuses can be transferred
to a DI function block.
Write the threshold for the upper limit switch to
LIMSW_HI_LIM, and the threshold for the lower
limit switch to LIMSW_LO_LIM.
A hysteresis of 1% is applied to the thresholds,
LIMSW_HI_LIM and LIMSW_LO_LIM.
CAUTION
To make a DI block read the on/off statuses of a
limit switch, set CHANNEL of the DI block to:
• 2, for reading the on/off status of the upper
limit switch.
• 3, for reading the on/off status of the lower
limit switch.
(5) Thresholds for Operation Result Integration
Alarms
The YVP110 has a function to integrate the
following operation result quantities individually:
• TOTAL_CYCLE_COUNT (incremented by 1
at each change in the direction of the action)
• TOTAL_TRAVEL (in % where full stroke =
100%)
• TOTAL_OPEN_TIME (in hours)
• TOTAL_CLOSE_TIME (in hours)
• TOTAL_NEAR_CLOSE_TIM (total at nearly
closed time in hours)
• SERVO_WARN_COUNT (Total number of
times of Servo output drift warning)
When these values exceed the respective
thresholds below, corresponding alarms are
output. Set the thresholds as necessary.
• CYCLE_COUNT_LIM
• TRAVEL_LIM
• OPEN_TIME_LIM
• CLOSE_TIME_LIM
• NEAR_CLOSE_TIME_LIM
Also, set NEAR_CLOSE_THRESHOLD,
which defines the threshold of the valve
position for counting NEAR_CLOSE_TIME,
as necessary.
For other alarms and self-diagnostic
functions, see “12.6 Online Diagnostics”.