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1.5 Assignment of Input/Output Numbers
B - 14
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
1.5.3 Connection of High-Speed Output Special Adapter
1. When the FX3U-16MR/ES uses an instruction that needs the high-speed inputting operation,
the main unit should have enough input terminals. Before selecting the main unit, be sure
to check the number of input points needed for the operation.
2. Specify the rotational direction signal of the positioning instruction depending on the
setting of each pulse output destination as shown in the following table:
3. To output the CLEAR signal using DSZR/ZRN instruction
The CLEAR signal output that is initially set for the DSZR/ZRN instruction is the same output as the direction
signal/reverse pulse train (rotation direction signal). Be sure to specify an output number of another transistor
output using the CLEAR signal
device specification function.
→ For details on the CLEAR signal device specification method, refer to
Subsection 4.3.4.
4. If high-speed output special adapter is connected to the FX3U Series main unit, the output
numbers will be assigned in the same way as the main unit.
If an output number assigned to a high-speed output special adapter is turned on by the sequence program,
the corresponding output of the main unit will also be turned on. Do not connect a line to both output
terminals. Connect a line to one of the output terminals.
The outputs of the high-speed output special adapter and the main unit will be turned on as shown in the
following table:
*1. The output frequency limit of the main unit transistor output is 100 kHz. When operating a load with a
pulse frequency exceeding 100 kHz, PLC failure may occur.
*2. Furthermore, use of the PWM (FNC58) is not recommended with the relay type main unit and the
high-speed adapters due to chattering of the relay contacts.
Pulse output destination Rotation direction signal
1st
Y000 Y004
Y001 Y005
2nd
Y002 Y006
Y003 Y007
Unit
Output operation
PLSY,PLSR,DSZR,
DVIT,TBL,ZRN,PLSV,D
RVI,DRVA instruction.
PWM instruction
Other
instruction
FX
3U Series main unit
of relay output type
While instruction is
activated, relevant
output is ON. (LED is
also ON.)
Use of the PWM (FNC58) instruction is not
compatible with a relay type main unit.
*2
Operated
FX
3U Series main unit
of transistor output
type
Operated
*1
Operated Operated
High-speed output
special adapter
Operated
Operated
The main unit should use the transistor output
type.
*2
Operated