Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 51)

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IM 04L31A01-01E
Explanation of Functions
3
2
1
4
5
6
7
8
9
10
11
12
13
14
1.10 Control Alarm Related Settings
Alarm Operating Conditions (Alarm Mode)
The following three types of alarm operating conditions are available for selection.
• Alarm is always enabled ← initial value
• Alarm is disabled when operation is stopped.
• Alarm is disabled when operation is stopped or during manual (MAN) operation mode.
Alarm Type
You can select the alarm type from the following.
Alarm
setpoint
Close
Hysteresis
PV
Open
Close
Hysteresis
Open
Hysteresis
Open
SP
Deviation
setpoint
Close
Open
Hysteresis
Close
Alarm action
(Open/close: relay contact status)
Alarm action
(Open/close: relay contact status)
Alarm type Alarm type
Hysteresis Hysteresis
Close Open Close
Deviation
setpoint
Hysteresis Hysteresis
Open Open
Close
Alarm setpoint Setpoint
Hysteresis
Hysteresis
Alarm setpoint Setpoint
Hysteresis
Alarm setpoint Output
value
Hysteresis
Alarm setpoint
PV high-limit
PV low-limit
Deviation
high-limit
Deviation
low-limit
Deviation
high & low
limit
PV
PV
Alarm
setpoint
SP
Deviation
setpoint
Deviation
setpoint
Deviation within
high & low
limits
SP high-limit
SP low-limit
Output high-limit
Output low-limit
Output
value
SP
PV
PV
PV
SP
Action When an Alarm Occurs
Alarms can be generated at the contact output and on the CX2000 display.
The alarm contact output can be assigned to the [DIGITAL OUT] terminal (see page 2-6) of the
control output terminal block and the control DIO expansion terminal block.
The alarm display can be confirmed by the mark on the control group displays, alarm occurrence
history on the alarm summary display, and the alarm icon on the operation status display section.
Note
• The CX2000 has measurement alarms (see section 1.15, “Measurement Function >
Measurement Alarm Related Settings”) in addition to the control alarms. The measurement
alarms can also be output at the contact output and on the display. Measurement alarms
can be output from the [DIGITAL OUT] terminal of the control output terminal block and the
control DIO expansion terminal block and the [ALARM] terminal of the measurement alarm
option terminal block. In terms of displays, the measurement alarms are displayed along
with control alarms on the alarm summary display. The alarm icon on the operation status
display section is shared with control alarms (indicator hold behavior is also common).
• You cannot assign the control alarm output to the [ALARM] terminal of the measurement
alarm option terminal block.