External Wiring Of Transistor Output; Triac Output Specifications; External Wiring Of Triac Output; Terminal Block Layouts - Mitsubishi Electric FX3U-128M series Hardware Manual

3.6.2

External wiring of transistor output

1. External wiring of sink output type
Load
Y000
Y001
Fuse
24 V DC
COM1
Load
Y004
Y005
Fuse
24 V DC
COM2
PLC
2. External wiring of source output type
Load
Y000
Y001
Fuse
24 V DC
+V0
Load
Y004
Y005
Fuse
24 V DC
+V1
PLC
3.6.3 Cautions in external wiring
For cautions in external wiring, refer to the following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
Protection circuit for load short-circuits
A short-circuit at a load connected to an output terminal could cause
burnout at the output element or the PCB. To prevent this, a
protection fuse should be inserted at the output.
Use a load power supply capacity that is at least 2 times larger than
the total rated fuse capacity.
Contact protection circuit for inductive loads
When an inductive load is connected, connect a diode (for
commutation) in parallel with the load as necessary.
The diode (for commutation) must comply with the following
specifications.
Item Guide
Reverse voltage 5 to 10 times of the load voltage
Forward current Load current or more
Interlock
Loads, such as contactors for normal and reverse rotations, that
must not be turned on simultaneously should have an interlock in the
PLC program and an external interlock.
3.7 Triac output specifications and example of
external wiring
As for the details of the triac output specifications and external
wiring, refer to the following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
3.7.1

Triac output specifications

Item Specification
FX -32MS/ES,
3U
Number
FX -16EYS, 16 points
2N
of output
FX -32ES
2N
points
FX -64MS/ES 32 points
3U
Refer to FX Series
3U
Output connecting type User's Manual - Hardware
Edition
Output form Triac (SSR)
External power supply 85 to 242 V AC
*
0.3 A/point ( 1)
Resistance load
Max. load
15 VA/100 V AC,
Inductive load
30 VA/200 V AC
0.4 VA/100 V AC,
Min. load
1.6 VA/200 V AC
1 mA/100 V AC,
Open circuit leakage current
2 mA/200 V AC
OFFON 1 ms or less
Response
time
ONOFF 10 ms or less
Output circuit insulation Photo-thyristor insulation
LED on panel lights when
Output operation display
photo-thyristor is driven.
*
( 1) The total load current of resistance loads per common
terminal should be the following value.
- 4 output points/common terminal: 0.8 A or less
- 8 output points/common terminal: 0.8 A or less
As for the number of outputs per common terminal, refer to
"Chapter 4 interpretation of partition" and the following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
3.7.2

External wiring of triac output

Load
Y000
Y001
AC power
Fuse supply
U
COM1
Load
Y004
Y005
AC power
Fuse
supply
U
COM2
PLC
3.7.3 Cautions in external wiring
For cautions in external wiring, refer to the following manual.
Refer to FX
3U Series User's Manual - Hardware Edition.
Protection circuit for load short-circuits
A short-circuit at a load connected to an output terminal could cause
burnout at the output element or the PCB. To prevent this, a
protection fuse should be inserted at the output.
Micro current load
The PLC's internal Triac output circuit is equipped with a turn-off C-R
absorber. When connecting a very low current load of "0.4 VA/100 V
AC or less, or 1.6 VA/200 V AC or less", please connect a surge
absorber parallel to the load.
Select the rated voltage of a surge absorber that is suitable for the
load being used. Refer to the table below for other specifications.
Item Guide
Approx. 0.1 F
Static electricity capacity
Resistance value Approx. 100 to 200 
Interlock
Loads, such as contactors for normal and reverse rotations, that
must not be turned on simultaneously should have an interlock in the
PLC program and an external interlock.
4.

Terminal block layouts

For details on the terminal block layout, refer to the following manual.
Refer to FX Series User's Manual - Hardware Edition.
3U
Interpretation of partition
The partition of the output terminals (see following figure) indicates
the range of the output connected to the same common.
Example: FX -48MT/ES
3U
Output terminal
Y0 Y2 Y4
COM1 Y1 Y3 COM2
Partition
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Exclusion of loss in opportunity and secondary loss from warranty liability
Regardless of the gratis warranty term, Mitsubishi shall not be liable for
compensation to:
(1) Damages caused by any cause found not to be the responsibility
of Mitsubishi.
(2) Loss in opportunity, lost profits incurred to the user by Failures of
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(3) Special damages and secondary damages whether foreseeable
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to products other than Mitsubishi products.
(4) Replacement by the user, maintenance of on-site equipment, start-up
test run and other tasks.

For safe use

 This product has been manufactured as a general-purpose part for
general industries, and has not been designed or manufactured to
be incorporated in a device or system used in purposes related to
human life.

Before using the product for special purposes such as nuclear
power, electric power, aerospace, medicine or passenger
movement vehicles, consult with Mitsubishi Electric.

This product has been manufactured under strict quality control.
However when installing the product where major accidents or
losses could occur if the product fails, install appropriate backup or
failsafe functions in the system.
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