540
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
20 Positioning Control – FNC150 to FNC159
20. Positioning Control – FNC150 to FNC159
FNC150 to FNC159 provide positioning instructions using the built-in pulse output function of the PLC.
→ For details, refer to the Positioning Control Edition manual.
Caution on writing during RUN
During RUN, avoid writing while any positioning control instruction (FNC150, FNC151, or FNC156 to
FNC159) is executed (that is, while pulses are output).
If program write is executed during RUN to a circuit block including a target instruction below while pulses are being
output, the PLC executes the operation shown below.
*1. Only available for FX3UC PLC Ver. 2.20 or later and FX3G/FX3U/FX3GC PLCs.
FNC No. Mnemonic Symbol Function Reference
150 DSZR DOG Search Zero Return Section 20.1
151 DVIT Interrupt Positioning Section 20.2
152 TBL Batch Data Positioning Mode Section 20.3
153 − −
154 − −
155 ABS Absolute Current Value Read Section 20.4
156 ZRN Zero Return Section 20.5
157 PLSV Variable Speed Pulse Output Section 20.6
158 DRVI Drive to Increment Section 20.7
159 DRVA Drive to Absolute Section 20.8
Target instruction
PLC operation when writing excuted during RUN while instruction is
executed
DSZR (FNC150)
Decelerates and stops pulse output.
DVIT (FNC151)
TBL (FNC152) Disables writing during RUN.
ZRN (FNC156) Decelerates and stops pulse output.
PLSV (FNC157)
During operation with
acceleration/deceleration
*1
Decelerates and stops pulse output.
During operation without
acceleration/deceleration
Immediately stops pulse output.
DRVI (FNC158)
Decelerates and stops pulse output.
DRVA (FNC159)
D2DSZR D1S2S1
D2DVIT D1S2S1
nTBL D
D2D1ABS S
DS3ZRN S2S1
PLSV D1 D2S
DRVI D1 D2S2S1
DRVA D1 D2S2S1
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