Toho-electronics TTM200 Manuel d'utilisateur Page 108

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48-7009-E 5-38
5.4.6 Loop abnormality function
What the loop abnormality is
The function is to detect an abnormality in the control loop.
When a value falls in the judgment domain with respect to the conditions of the control loop
anomaly MV threshold(MS*) and control loop anomaly PV threshold(tS*), the control loop anomaly
PV change threshold is judged at each LoP* time.
A loop abnormality is determined if each change threshold is judged to be equal to or below PS*.
When [PS* = 0] is true, only time judgment is executed using LOP*.
When the time satisfying threshold of TS* or MS* exceeds LOP*, the loop abnormality is
determined as detected.
(The symbol * takes the following values: 1 for the primary control and 2 for the secondary
control.)
The loop abnormality function is usable when one of OUT 1 to OUT 7 is selected for the event
loop abnormality existent.
About primary control loop abnormality-related setting ............................. P6-24~27
About secondary control loop abnormality-related setting .......................... P6-37~40
About event function 4 loop abnormality(E1~7F4) setting ......................... P6-44
Monitoring
time
(LoP*)
ON
OFF
SV
PV
MLL*
MLH*
MV*
Monitoring
time
(LoP*)
Monitoring
time
(LoP*)
Loop
abnormality
Judgment
domain
Non-
judgment
domain
Judgment
domain
Non-
judgment
domain
Control loop
anomaly PV
threshold
(TS*)
Control loop
anomaly MV
threshold
(MS*)
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