Maple Systems MAPware-7000 User Manual
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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
√
√
√
√ √
√