Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 421)

App-52
IM 04L31A01-01E
Function
Cuts (sets to 0) measured values on channel 1 that are negative or greater than 15, and integrates them.
Expression
31 = ((01.GE.K01)AND(01.LE.K02))*01
32 = TLOG.SUM(31)
K01 = 0
K02 =15
Explanation
When the value of channel 1 is negative, (01.GE.K01) is 0. When the value of channel 1 exceeds 15, (01.LE.K02) is 0.
Therefore, when the value of channel 1 is negative or exceeds 15, the value of channel 31 is 0. Channel 32 integrates
the measured value of channel 31.
Applies a Lowcut and Highcut to Measured Values and Integrates Them
Measured value of channel 1
Measured value of channel 31
0
0
0
0
1
1
15
15
01.GE.K01
01.LE.K02
Function
An alarm occurs when the value of channel 1 is 55 or higher. Once the alarm occurs it is not released until the value of
channel 1 falls below 50.
Expression
31 = (31OR01.GE.K01)AND01.GE.K02
K01 = 55
K02 = 50
Set an upper limit alarm on channel 31 with an alarm value of 1.
Explanation
When the value of channel 1 gradually increases to 50 or higher, 01.GE.K02 becomes 1. When the value of channel 1
increases further to 55 or higher, 01.GE.K01 becomes 1. The value of channel 31 becomes 1, and an upper limit alarm
occurs on channel 31.
When the value of channel 31 is 1, it remains at that value even if the value of channel 1 falls in the range from 50 to 55.
If the value of channel 1 decreases further to below 50, the value of channel 31 becomes 0. The upper limit alarm on
channel 31 is released.
Setting a Margin around the Value Measured upon Occurrence and Release of Alarms (Alarm Hysteresis)
Measured value of channel 1
Measured value of channel 31
55 50
0
0
1
0
1
1
Alarm occurrence
Alarm release
01.GE.K02
01.LE.K01
Appendix 10 Expression Examples