Description
3.8 Limits
SENTRON PAC4200
System Manual, 09/2009, A5E02316180B-02
45
Figure 3-12 LIMIT LOGIC
The following logic operations can be selected for each logic function block:
● AND (AND operation)
● NAND (NOT AND operation)
● OR (OR operation)
● NOR (NOT OR operation)
● XOR (EXCLUSIVE OR operation)
● XNOR (EXCLUSIVE NOT OR operation)
Any limit values and the digital inputs of SENTRON PAC4200 can be selected at the inputs
of the upstream logic function blocks. The input value is the truth value of the monitored
signal:
● True: Limit value is violated or input is active
● False: Limit value is not violated or input is not active
Displaying limit violations
SENTRON PAC4200 outputs limit violations at the digital output or via the interfaces.
Limit violations are countable. One of the limit values can be assigned to the universal
counters.
Limit violations are recorded as events with additional information on the monitored
measured variable and the monitored threshold.
Limit violations are shown on the following displays:
● MAIN MENU > SETTINGS > ADVANCED > LIMITS
● ... > LIMITS > LIMIT LOGIC
Left column: Limit value designation
Middle column: Monitored data source
Right column: Limit value currently violated: Yes
, No
Figure 3-13 Representation of limit violations
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