Maple Systems MAPware-7000 - Manual (Page 159)

151 MAPware-7000 Ladder Logic Guide
1010-1041 rev. 00
T
S
= the scan interval (range: 0 to +32767)
K
D
= the derivative gain constant (range: -32768 to +32767)
S = setpoint value (range: -32768 to +32767)
P = present value (range: -32768 to +32767)
GP = the gap or dead-band value. A dead-band limit causes the PID instruction to only
execute when the error value is less than the dead-band value. The dead band must be
given as a percentage of the setpoint value (i.e. range is 0 to 100). For example, if
GP=10, and S=200, then 10% of 200 is 20, so the dead-band gap is the range of 180-220.
Notes:

When the PID instruction is not executed, the manipulation value (M) is set
automatically to 0 or 4095, depending upon:
if S > P then M=4095
if P > S then M=0
Execution Condition:
Input Operation Output
OFF Initialization OFF
ON Execute PID every setting interval ON
Operand:
Coil or Bit Register Constant Index
Name X Y B S T. C. M
X
W Y
W B
W S
W
T C D I J K
M
W
A
Top of Input
Data
√ √ √ √ √ √ √
B
Top of
Parameter
√ √ √ √ √ √ √
C
Top of
Output Data
√ √ √ √ √ √