10 - 10 10 - 10
MELSEC-Q
10 DEVICES
10.2.3 Internal relays (M)
(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 on the number of contacts (N/O contacts, N/C
contacts) used in the program, provided the program capacity is not
exceded.
X0
M0
T0
Y20
X1
M0
M100
X2 M0
M2047
SET M0
K20
No restrictions on the quantity used.
M0 switches ON at X0 OFF to ON
The internal relay (M0) ON can only be used for internal
High Performance model QCPU processing, and cannot
be output externally.
M0 ON/OFF information is output from the output module
to an external destination.
Figure 10.5 Internal Relay
(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 on latch relays.
To Next Page
Loading...
Need help?
General
