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These instruments are capable to detect, on the main input, the
sensor leads break condition.
When the sensor leads break condition is detected, the
instrument shows “OPEn” on the upper display.
Note
Note
Note
Note
Note: On the linear input the leads break can be detected only
for 4-20 mA, 1-5 V, 2-10 V, 0-60mV and 12-60 mV ranges.
In addition, on RTD input a special test is provided to signal
“Shrt” when input resistance is less than 12 (Short circuit
sensor detection).
When a fault condition different from overrange or underrange
is detected on the main input, the alarms,the power output and
the analog retransmissions operate as in presence of an
overrange condition.
NOTE
NOTE
NOTE
NOTE
NOTE: if, when a program is running, a fault condition on the
main input is detected, it has no effect on the program
execution and on the timer events.
d) When “SF.Cn” [C.G09] is set to “Undr”
d.1) if an underrange condition is detected, the power
output is forced to the safety value “SF.UL” [C.G10]
d.2) if an overrange condition is detected the instrument will
operate as described at point a.1).
NOTE
NOTE
NOTE
NOTE
NOTE: IN ALL CASES ABOVE DESCRIBED THE OUTPUTS
WILL BE FURTHER INFLUENCED BY “OUTPUT CONDITION-
ING”
When servomotor open loop is configured, the “Condition for
output safety value” ("SF.Cn [C.G09]) acts as described below:
1) When “SF.Cn” [C.G09] is set to “Cnd.A” and an overrange or
an underrange condition is detected, the servomotor is
driven to its high limit position (OUT 3 “ ” will be maintained
closed).
2) With “SF.Cn” [C.G09] is set to “Cnd.b” and an overrange or
an underrange condition is detected, the servomotor is
driven to its low limit position (OUT 4 “ ” will be maintained
closed).
3) When “SF.Cn” [C.G09] is set to “Cnd.C” the out-of-range
condition acts on the control output as the complement of
effect described at point a).
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