Automating Manufacturing Systems - Process Control and ...

plc function ref - 34.10
RTO - RetentiveTimer On
A
Description:
Status Bits:
Registers:
RTO
RETENTIVE TIMER ON
Timer T4:0
Time Base 1.0
Preset 10
Accum. 0
This timer will delay turning on. When the input turns on the accumulated
value (ACC) will start to increase from zero. When the preset (PRE)
value is reached the DN bit is set. If the input goes false the accumulator
value is not reset to zero. To reset the timer and turn off the timer the
RES instruction should be used.
EN
TT
DN
ACC
PRE
Available on: Micrologix, PLC-5
This bit is true while the input to the timer is true
This bit is true while the accumulator value is increasing
This bit is true when the accumulator value is less than the preset
value
The time that has passed since the input went true
The maximum time delay before the timer goes on
34.1.4 Compare
CMP - CoMPare
CMP
COMPARE
Expression
“(N7:0 + 8) > N7:1”
A
Description:
Status Bits:
This function uses a free form expression to compare the two values. The
comparison values that are allowed include =, >, >=, ,