Software Interface
2-18
Block Read Data: PLC → Module (continued)
Bits
14–16
(inject
and pack and hold profiles only)
Pressure T
ransition Inhibit
Velocity Byte
Pressure Byte
Description
18916Permits
transition on
pressure during steps:
[.... ....] [.... .000] 1
through 10
[.... ....] [.... .001] 2
through 10
[.... ....] [.... .010] 3
through 10
[.... ....] [.... .011] 4
through 10
[.... ....] [.... .100] 5
through 10
[.... ....] [.... .101] 6
through 10
[.... ....] [.... .110] 7
through 10
[.... ....] [.... .111] 8
through 10
2.6.12
Constant 1
1 contains the pressure loop gain value. Gain constant for PID
calculation: 0–32767 in PLC = 0–3.2767 %/%.
For example, 10,000 = gain of 1.
2.6.13
Constant 12 contains the pressure loop rate (derivative) value. Rate
constant for PID calculation: 0–32767 in PLC = 0–327.67 ms.
For example, 2500 = rate of 25 ms.
2.6.14
Constant 13 contains the Pressure loop reset (integral) value. Reset
constant for PID calculation: 0–32676 in PLC = 0–327.67 ms.
For example, 300 = reset of 3 ms.
NOTE:
The larger the reset value
⇒
the smaller the reaction time on the
PID calculation.
2.6.15
Constant 14 contains the velocity/pressure data acquisition bit values. The
values stored in constant 14 bits determine velocity filter constants. A zero
in this word accepts the default selection as follows:
• V
elocity filter time constant of zero if velocity filter selected by bits 3
and 4 of word 10
•
Pressure setpoint not forced into the bias term
•
No reverse acting for velocity or pressure loop
Constant 10
(continued)
Constant 11
Constant 12
Constant 13
Constant 14
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