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7. Action explanation
7.1 High limit control action (Fig. 7.1-1)
Auto limit control will be used for purposes of explanation of the High limit control action. (Refer to Section 7.3)
(Fig. 7.1-1)
(1) Limit control action will initiate after power supply to the controller is turned on.
(2) If PV exceeds SV, the EXCEEDED and RESET indicators light, and
OUT1 (Limit control output terminals 15 and 16) is turned OFF.
(3) If PV drops below [SV-OUT1 hysteresis], the EXCEEDED indicator goes off.
At this time, the RESET indicator is lit, and OUT1 (Limit control output terminals 15 and 16) is in OFF
status.
(4) If the key is pressed, or if external reset input terminals 9 and 12 are shorted, the RESET
indicator goes off, OUT1 (Limit control output terminals 15 and 16) is turned ON, and limit control
action initiates again.
(5) While the EXCEEDED indicator is lit, even if the key is pressed or even if external reset input
terminals 9 and 12 are shorted, limit control action does not initiate.
The key or External
reset input
Energized action
POWER OFF
POWER ON
Unlit
RESET indicator
EXCEEDED indicator
OUT1 hysteresis
Lit
SV
PV
ClosedOpen
Lit
Unlit
Closed
Unlit
Unlit
OUT1 15-16
(1) (2) (3) (4)
(5)
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