194 Rockwell Automation Publication 1426-UM001J-EN-P - August 2019
Chapter 7 Logic Functions
Equal To
An Equal To test condition arms the setpoint for activation when the monitored
value exactly equals the threshold, and dis-arms the setpoint when the value no
longer equals the threshold. Hysteresis is ignored in the Equal To test condition.
Figure 36
illustrates this test condition. In Figure 36, the setpoint is armed at
point A, dis-armed at point B, and armed at point C. Point d also arms the
setpoint but the value changes at point e before the assert delay time passes.
Figure 36 - Equal To Test Condition
Setpoint Logic Gates (M6 and M8 models)
Up to 10 logic gates can be used to combine logically the setpoints to enable
output actions. Each logic gate can have up to four inputs. Select among AND,
NAND, OR, NOR, XOR, or XNOR logic. XOR and XNOR use inputs 1 and
2.
In Figure 37
, Setpoint Output 1 activates when Setpoint 1 asserts. Setpoint
Output 2 activates when both Setpoint 1 and Setpoint 2 assert.
Figure 37 - Setpoint Example
Assert
Delay
Deassert
Delay
Output
Threshold
AB
C
d
e
Assert
Delay
Setpoint 1
· Parameter Selection 1
· Reference Value 1
· Test Condition 1
· Evaluation Type 1
· Threshold 1
· Hysteresis 1
· Assert Delay Seconds 1
· Deassert Delay Seconds 1
Setpoint 2
· Parameter Selection 2
· Reference Value 2
· Test Condition 2
· Evaluation Type 2
· Threshold 2
· Hysteresis 2
· Assert Delay Seconds 2
· Deassert Delay Seconds 2
Logic Gate 1
· Logic Level 1 Gate 1
Function: AND
· L 1 _ G1 Input 1 : Setpoint 1
· L 1 _ G1 Input 2 : Setpoint 2
· L 1 _ G1 Input 3 : Disabled
· L 1 _ G1 Input 4 : Disabled
Setpoint Output 1
Setpoint Output 1 Input Source : Setpoint 1
Setpoint Output 1 Action
Setpoint Output 2
Setpoint Output 2 Input Source : Logic Gate 1
Setpoint Output 2 Action
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