Internal Relay (M) - Mitsubishi MELSEC QS Series User Manual

9
DEVICE EXPLANATION

9.2.3 Internal relay (M)

(1) Definition
(2) Number of used N/O and N/C contacts
(3) Procedure for external outputs
9
- 8 9.2 Internal User Devices
9.2.3 Internal relay (M)
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
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.
X100
M0
X102 M0
X104 M0
Diagram 9.9 Use of internal relays in program
Outputs (Y) are used to output sequence program operation results to an external
destination.
No restrictions on the quantity used.
M0 switches ON at X100 OFF to ON.
SET M0
The internal relay (M0) ON can only be used for
internal CPU module processing, and cannot be
output externally.
K20
T0
Y100
M0 ON/OFF information is output from the CC-Link
safety remote I/O unit to an external destination.
M100
M2047