Inovance H3U Series - Page 297

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4
4 Instructions4.9.6 Refreshing
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Example 1:
X20
〔REF X0 K16 〕
When the preceding program is executed, if X20 = ON, the input statuses of X0 to X17 are read
immediately and input signals are updated. No input delay is incurred.
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Example 2:
X0
〔REF Y0 K16 〕
When the preceding program is executed, if X0 = ON, the statuses of Y0 to Y17 are refreshed and output
signals are updated immediately, without waiting for the END instruction.
REFF: Input lter time adjustment
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Overview
When driving conditions are met, the REFF instruction sets the lter time constants of X0 to X7 input ports
to n ms.
REFF n
Input lter time
adjustment
Applicable model:
H3U
n Filter time Unit: ms
16-bit instruction
(5 steps)
REFF:
Continuous
execution
REFFP: Pulse
execution
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Operands
Operand
Bit Element Word Element
System·User System·User Bit Designation Indexed Address Constant
Real
Number
n X Y M T C S SM D R T C SD KnX KnY KnM KnS KnSM
V,Z
Modication K H E
Note: The elements in gray background are supported.
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Function
The lter time constants of X0 to X7 input ports are set to n ms.
In the PLC, X0 to X7 ports use digital lters. The default lter time constant is set by D8020. Use the
REFF instruction to change the value in D8020 within the range 0 ms to 60 ms. Other X ports support only
hardware RC lter. The lter time constant is about 10 ms, which cannot be modied.
When a high-speed counter is used or the X input interrupt function is enabled, the lter time of related
ports is automatically adjusted to the shortest time, whereas the lter time of unrelated ports remains
unchanged.
You can also use the MOV instruction to assign a value to D8020; then the lter time is changed.