Internal Relays (M) - Mitsubishi Electric MELSEC-Q Series User Manual

10 DEVICES

10.2.3 Internal relays (M)

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(1) Definition
(a) Internal relays are auxiliary relays which cannot be latched by the
programmable controller's internal latch (memory backup).
All internal relays are switched OFF at the following times:
• When power is switched from OFF to ON.
• When reset occurs.
• When latch clear operation is executed.
(b) There are no restrictions regarding the number of contacts (N/O contacts,
N/C contacts) used in the program.
X0
M0
X1 M0
X2 M0
(2) Procedure for external outputs
Outputs (Y) are used to output sequence program operation results to an
external destination.
REMARK
1) Latch relays (L) should be used when a latch (memory backup) is required.
See Section 10.2.4 for details regarding latch relays.
No restrictions regarding the quantity used.
M0 switches ON at X0 OFF to ON
SET M0
The internal relay (M0) ON can only be used for internal
Basic model QCPU processing, and cannot be output
externally.
K20
T0
Y20 M0 ON/OFF information is output from the output module
to an external destination.
M100
M2047
Figure 10.5 Internal Relay
MELSEC-Q
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