Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 63)

1-51
IM 04L31A01-01E
Explanation of Functions
3
2
1
4
5
6
7
8
9
10
11
12
13
14
PV Event
This function outputs preset alarms such as PV alarms and deviation alarms during
program operation. PV events operate only within the specified segment.
The following table shows the types of PV events. Hysteresis can be specified for each event.
Alarm
setpoint
Close
Hysteresis
Process
value
Open
Close
Hysteresis
Open
Hysteresis
Open
SP
Deviation
setpoint
Close
Open
Hysteresis
Close
Relay action
(Open/close: relay contact status)
Relay action
(Open/close: relay contact status)
Event type Event type
Hysteresis Hysteresis
Close Open Close
Hysteresis Hysteresis
Open Open
Close
Setpoint
Hysteresis
Hysteresis
Alarm setpoint Setpoint
Hysteresis
Output value
Hysteresis
Output value
PV high-limit
PV low-limit
Deviation
high-imit
Deviation
low-limit
Deviation
high & low
limit
PV Alarm
setpoint
Alarm
setpoint
Alarm
setpoint
Alarm
setpoint
Deviation
setpoint
Deviation
setpoint
Deviation
setpoint
Deviation within
high & low limits
SP high-limit
SP low- limit
Output high-limit
Output low-limit
PV
SP
SP
SP
PV
PV
PV
Note
• If the setup conditions of PV events are not specified using the same conditions also in the
next segment, they are reset at the time the operation of the specified program segment
ends.
• With cascade control, you can set PV events to the primary loop and secondary loop.
Switching the Program Pattern Using Contact Inputs
Contact input is applied at [DI001-DI006], [DI101-DI106], and [DI201-DI206] of the
control output terminal block, and [RI001-RI006] on the control DIO expansion terminal
block.
• Before version 3.02
The program pattern is changed using contact inputs of binary representation.
• Version 3.20 and later
In addition to the binary representation, the program pattern can be changed using
contact inputs of binary-coded decimal (BCD) representation. You can select Whether
to use [Binary] or [BCD]. The default setting is [Binary].
1.11 Program Control Related Settings