Toshiba PNE001Z Function Manual page 26

4.3.1. Tolerance Range (ZSW Bit 8)
If the setpoint is changed:
1. ZSW Bit 8 is set 0
2. Calculate the tolerance.
3. Start the timer which will time-out based on parameter Tmax.
PNE001Z checks that the timer (Tmax) has not timed-out and if the actual value is within the tolerance. If
both conditions are fulfilled ZSW Bit 8 is set 1 and the timer is stopped.
The figure shows ZSW 8 when Tolerance (
Tolerance
= HIW ± (HIW * 50%)
HIW
15s
Tmax
= 3s
ZSW Bit 8
) is 50% and Tmax (
c157
Setpoint
Actual value
20s 25s
Tmax
- 23 -
) is 3s.
c151
30s
Tmax
E6582051
HIW = 0x4000
HIW = 0x3000
HIW = 0x2000
HIW = 0x1000
HIW = 0x0000
Time