Toshiba Tosvert VF-MB1/S15 - Manual (Page 14)

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3.3.1. 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.
PDP003Z 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 ( c157 ) is 50% and Tmax ( c151 ) is 3s.
actual value setpoint
HIW = 0x4000
HIW = 0x3000
HIW = 0x1000
HIW = 0x0000
HIW
HIW = 0x2000
20s 25s 30s 15s
Tolerance
= 0x4000 * 50%
Time
ZSW Bit 8
Tmax
= 3s
Tmax Tmax