Chapter 3 – Installation and Wiring
3–10
GLC2300 Series User Manual
For example, connect an electrical voltage relay coil to the GLC output unit power
supply circuit and to any connected control devices’ power circuit, then connect
their contacts to the GLC input unit. Design the circuit so that it checks for an ON
signal from the electrical voltage relay using a logic program, then executes the
ladder program of the control device connected to the GLC output unit.
Input Voltage
The power supply must be DC 24V (between DC 20.4V and DC 28.8V).
Power Interruption
When a power supply interruption is 10 ms. or longer, the GLC unit’s power will
also be interrupted. Also, when a power interruption occurs, operation will stop
even while a command is being issued.
For example, if the power is cut while an FMOV command is sending data in 100-
word units, command execution will stop.
When designing a logic program, be sure to allow for the possibility of a power
interruption.
Emergency Stop Circuit
Do NOT send an Emergency Stop signal to the GLC, and do NOT use the GLC
unit’s internal software to process an Emergency Stop signal.
Be sure to create the Emergency Stop circuit outside the GLC (see below).
GLC
Emergency Stop Button
B contact
Power source
AC
DC 24V
Output
Input
Controlled
System
