Omron E5CN-FR Manual page 12

Limit Controller Functions
When the measured temperature (PV) exceeds the limit SP, the limit output relay turns OFF and the OUT1 operation indicator turns ON. If the
limit output relay turns OFF (limit alarm is ON), the limit output relay will remain off until the operator manually resets the Limit Controller.
■ Selecting Upper/Lower Limit
• The upper/lower limit selection setting enables switching between upper limit and lower limit operation.
• The default setting is for upper limit operation.
Select either upper limit or lower limit.
■ Resetting Limit Outputs
• Limit outputs can be reset by pressing the Level Key/Reset Key for 1 second min. while in the operation level.
• The limit output reset operation can be used to reset limit outputs and annunciator outputs.
∗ When the limit status is OFF, the limit output is cleared and the limit output relay turns ON. When the limit status is ON (limit over status), limit
outputs will not be reset.
∗ The annunciator output turns OFF regardless of the limit status.
∗ Event inputs used as reset inputs (for resetting limit outputs) can be received while in the operation level, adjustment level, or protect level.
12
Limit Controller
Before turning
Limit output relay ON
ON power
Limit SP
Control SP
Power ON
Limit SP
ON
Limit status
OFF
ON
Annunciator output
OFF
ON
Limit output relay
OFF
(1) RESET
(Reception
not possible)
E5CN-FR
Limit output relay OFF
Temperature in furnace
Malfunction
(2) RESET (3) RESET
(Reception (Reception
possible) not possible)
Hysteresis
Hysteresis