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16
Control Output Function
The relay output operates in fail-safe mode (relay de-
energized during reset condition) and latching mode.
The control output turns OFF when the setpoint is ex-
ceeded when C1 = Hi, or C1 = Lo. (When C1 = Hi.Lo
control output turns off when the process is greater than
“Su” or less than “S1”).
The control output remains OFF until the process is
within setpoint and the acknowledge action has been
performed (the sequence of action may or may not be
important depending on parameter C2).
The upper display flashes when the setpoint is exceeded
and returns to a steady display when the process is within
setpoint.
When the control output is OFF the RESET LED is ON
(if C2 = 0) or flashes (if C2 = 1).
When C2 = 1 the RESET LED is steady ON when control
output is OFF and acknowledged.
The reset condition can be stored in permanent memory
(see C4).
Acknowledgment can be performed by pressing the
RESET key, by momentarily closing the external dry
contact or by a command from the serial link.
The length of the reset condition and max/min values
detected are stored in memory and available for viewing
until the next reset condition occurs. The information is
lost at power down.
During a reset condition the values are continuously
updated and can be monitored.
HS
(Setpoint
threshold
hysteresis)
Flash
Upper display
Steady
ON
"Reset" LED
OFF
ON
Relay OUT 1
OFF
ABC
Su
(Setpoint
threshold)
FLASH
FLASH
(Hysteresis)
Flash
Upper display
Steady
ON
"Reset" LED
OFF
ON
Relay OUT 1
OFF
AB
Su
(Setpoint
threshold)
FLASH FLASH
FLASH
FLASH
A, B, C = Acknowledgment action by RESET button,
digital input or serial link. NOTE: Acknowledgment B has
no effect.
Example of limit function when C1 = Hi and C2 = 1
A, B = Acknowledgment action by RESET button, digital
input or serial link.
Example of limit function when C1 = Hi and C2 = O
7sl-2-00.p65 9/17/02, 2:40 PM16