39
EVT output:
• Alarm output
[Alarm, Loop break alarm and Heater burnout alarm (W option) utilize common output
terminals.]
The alarm action point is set by
deviation from the SV (excluding Process alarm), and when
input goes outside the range, alarm output is turned ON or OFF (High/Low limit range alarm).
When De-energized is selected in [Alarm Energized/De-energized], alarm output is activated
conversely.
Setting accuracy: Same as basic accuracy
Action:
ON/OFF action
Hysteresis:
Thermocouple, RTD input: 0.1 to 100.0
( )
DC voltage, current input: 1 to 1000 (The placement of the decimal point
follows the selection.)
Output:
Open collector, Control capacity: 0.1 A 24 V DC
Alarm type:
One alarm action can be selected from below by front keypad operation:
High limit, Low limit, High/Low limits, High/Low limits independent alarm,
High/Low limit range, High/Low limit range independent alarm, Process
high, Process low, High limit with standby, Low limit with standby,
High/Low limits with standby, High/Low limits with standby independent
alarm, and No alarm action
The above 12 alarm types and No alarm action can be selected.
Energized/De-energized: Alarm (EVT) output Energized/De-energized can be selected.
Energized
De-energized
EVT indicator (Red)
Lights
Lights
EVT output
ON
OFF
Alarm HOLD function: Once the alarm is activated, alarm output is maintained
until the power is turned off.
• Loop break alarm output
[Loop break alarm, Alarm and Heater burnout alarm (W option) utilize common output
terminals.]
Detects heater burnout, sensor burnout and actuator trouble.
Setting range: Loop break alarm time: 0 to 200 minutes
Loop break alarm span:
Thermocouple, RTD input: 0 to 150
( ) or 0.0 to 150.0
( )
DC voltage, current input : 0 to 1500 (The placement of the decimal
point follows the selection.)
Output: Open collector, Control capacity: 0.1 A 24 V DC
Converter function:
See “6. Simplified Converter Function”.
Attached function:
[Set value lock]
[Sensor correction]
[Power failure countermeasure]
The setting data is backed up in non-volatile IC memory.
[Self diagnosis]
The CPU is monitored by a watchdog timer, and when an abnormal status is found on the
CPU, the controller is switched to warm-up status turning all outputs off.
[Automatic cold junction temperature compensation] (Only thermocouple input)
Detects the temperature at the connection terminal (between the thermocouple and the
instrument), and maintains it at the same status as if the reference junction location
temperature were at 0
(32 ).
[Burnout]
When the thermocouple or RTD input is burnt out, OUT is turned OFF (for direct current
output, OUT low limit value), and the PV Display flashes “
”.
Summary of Contents for DCL-33A
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