Mitsubishi Q Series Programming Guide

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MELSEC-Q
1 GENERAL DESCRIPTION
(5) Program design is easy due to a wealth of step attributes
A variety of step attributes can be assigned to each step. Used singly for a given control
operation, or in combination, these attributes greatly simplify program design procedures.
• Types of HOLD steps, and their operations
1) Coil HOLD step (
SC
)
oY10
aX1
Step which is active due
to transition condition
being satisfied.
Transition condition
is satisfied.
Coil output is maintained.
(Timer maintains the count.)
SC
• After transition, the operation of the
operation output is continued (put in
HOLD status) and the coil output
status when the transition condition
is satisfied is maintained.
• Transition will not occur if the
transition condition is satisfied again.
• Convenient for maintaining an
output until the corresponding block
is completed (hydraulic motor
output, pass confirmation signal,
etc.).
• When the output mode at block stop
is OFF, it remains OFF after a block
restart.
2) Operation HOLD step (no transition check) (
SE
)
oY10
aX1
Transition condition
is satisfied.
Operation is continued.
(Timer continues counting.)
SE
Step which is active due
to transition condition
being satisfied.
• After transition, the operation of the
operation output is continued (put in
HOLD status).
• Transition will not occur if the
transition condition is satisfied again.
• When the output mode at block stop
is OFF, the operation is continued
after a block restart, and therefore,
the output is provided as a result of
the operation that has been
performed.
3) Operation HOLD step (with transition check) (
ST
)
Operation is continued.
(Timer continues counting.)
oY10
pX1
Transition
condition
is satisfied.
Transition
condition
is again
satisfied.
ST
Step which is active due
to transition condition
being satisfied.
Step which is active due
the previous transition
condition being satisfied.
• After transition, the operation of the
operation output is continued (put in
HOLD status).
• When the transition condition is
satisfied again, transition is
executed and the next step is
reactivated.
• The operation of the operation
output is executed at the reactivated
next step, and when the transition
condition is satisfied, transition
occurs and the step is deactivated.

Mitsubishi Q Series Specifications

General

I/O Points	Up to 4096 points
Communication	Ethernet, RS-232, RS-485
I/O Modules	Digital, Analog, Specialized
Programming Language	Function Block Diagram, Structured Text
Power Supply	24V DC, 100-240V AC
Operating Temperature	0°C to 55°C
Shock Resistance	147 m/s2 acceleration, 3 times in each of X, Y, and Z directions
Program Capacity	Up to 252K steps