56
Fail-safe Circuits
Section 3-5
Connecting Cables
Connecting to the Computer
Available Connecting Cables
Note
The CS1W-CN225/-CN625/-CN227/-CN627 Connecting Cables and the
FIT10/20 CQM1-CIF11 Connecting Cables cannot be used with the Customi-
zable Counter Unit.
3-5
Fail-safe Circuits
You must set up safety circuits outside of the Customizable Counter Unit to
prevent dangerous conditions in the event of errors in the Unit or external
power supply. Take particular care of the following points.
!WARNING
Take any safety measures necessary outside of the Unit to ensure the safety
of the system in the event of an error due to Unit malfunction or external fac-
tors. Failure to do so could lead to a serious accident.
• Provide interlock circuits, limit circuits, emergency stop circuits, and simi-
lar safety measures in the PLC’s external control circuits.
• Operation will stop and all contact and pulse outputs will turn OFF when
the PLC detects an error or when a FALS(07) (fatal error) instruction is
executed. You must take any safety measures necessary outside of the
Unit to ensure the safety of the system in the event that all contact and
pulse outputs turn OFF.
• It is possible for an output to remain ON or OFF due to a factors, such as
damage to a transistor in the internal circuit of a contact output. Provide
any circuits necessary outside of the PLC to ensure the safety of the sys-
tem in the event that a contact output fails to turn OFF or ON.
• If there is an overload or a short-circuit in the Power Supply Unit’s 24-VDC
output (service power supply), the voltage may drop and the outputs may
Computer
Connecting to peripheral port
IBM PC/AT or compatible
(D-sub, 9-pin male)
IBM PC/AT computer
(9-pin, male)
Customizable
Counter Unit
CS-series
CPU Unit
Peripheral port
CS1W-CN226/-CN626
Connecting Cable
(for IBM PC/AT or
compatible)
Customizable
Counter Unit
port
Programming
Device
connection
switch setting
Computer
Serial
communications
mode
Model number
Length
Peripheral port
ON
IBM PC/AT or
compatible
Port: D-sub,
9-pin, male
Peripheral bus
CS1W-CN226/626
2 m/6 m
CS1W-CN118 and XW2Z-
200S-CV/500S-CV (Use
XW2Z-
@@@
S-CV for which
ESD countermeasures
have been taken.)
0.1 m + 2 m/5 m
Содержание CS1W-HCA12-V1
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