9
DEVICE EXPLANATION
9
- 8
9.2 Internal User Devices
9.2.3 Internal relay (M)
9.2.3 Internal relay (M)
(1) Definition
Internal relays are auxiliary relays used in the CPU module.
All internal relays are switched OFF at the following times:
• When the PLC is powered OFF and then ON
• When the CPU module is reset
(2) Number of used N/O and N/C contacts
There are no restrictions on the number of contacts (N/O contacts, N/C contacts) used
in the program, provided the program capacity is not exceded.
(3) Procedure for external outputs
Outputs (Y) are used to output sequence program operation results to an external
destination.
Diagram 9.9 Use of internal relays in program
X100
M0
T0
Y100
X102 M0
M100
X104 M0
M2047
SET M0
K20
No restrictions on the quantity used.
M0 switches ON at X100 OFF to ON.
The internal relay (M0) ON can only be used for
internal CPU module processing, and cannot be
output externally.
M0 ON/OFF information is output from the CC-Link
safety remote I/O unit to an external destination.
Summary of Contents for MELSEC QS Series
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