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20 Terminal Block
20.9 FX-16EYS-TB
374
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
20.9.4 External wiring precautions
1. 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.
2. 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 "0.4VA/100V AC or less or 1.6VA/200V 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.
Reference
3. Interlock
For loads such as forward/reverse contactors, etc., where
a hazardous condition could result if switched ON
simultaneously, an external interlock should be provided
for interlocking the PLC's internal programs as shown to
the right.
4. In-phase
PLC output contacts (*) should be used in an "in-phase"
manner.
Guide
Static electricity capacity Approx. 0.1 F
Resistance value
Approx. 100 to 200
Manufacturer Model name Manufacturer Model name
Okaya Electric Industries Co., Ltd. CR-10201 Rubycon Corporation 250MCRA104100M B0325
Terminal block
0 to 7
COMn
Load
Fuse
Micro current load
Surge
absorber
U
Interlock
PLC output
element
Forward
limit
Reverse
limit
Forward
Reverse
U
U
U
*
*
*
*
U
U
U
Bad
Good