Step Relay (S); Timer (T) - Mitsubishi Electric Q01UCPU User Manual

4.2.9

Step relay (S)

This device is provided for SFC programs. For how to use the step relay, refer to the following manual.
MELSEC-Q/L/QnA Programming Manual (SFC)
Because the step relay is a device exclusively used for SFC programs, it cannot be used as an internal relay in the sequence
program.
If used, an SFC error will occur, and the system may go down.
4.2.10

Timer (T)

Time counting starts when a coil is turned on, and it times out and the contact turns on when the current value reaches
the set value.
The timer is of an incremental type.
(1) Timer types
Timers are mainly classified into the following two types.
1) Timer of which value is set to 0 when the coil is turned off.
2) Retentive timer that holds the current value even if the coil is turned off.
Also, low-speed and high-speed timers are included in timer 1), and low-speed and high-speed retentive timers
are included in timer 2).
(2) Specification of the timer
• The same device is used for the low- and high-speed timers, and the type is determined according to the
instruction used.
For the OUT T0 instruction, the low-speed timer is specified, and for the OUTH T0 instruction, the high-
Ex.
speed timer is specified.
• The same device is used for the low- and high-speed retentive timers, and the type is determined according
to the instruction used.
For the OUT ST0 instruction, the low-speed retentive timer is specified, and for the OUTH ST0 instruction,
Ex.
the high-speed retentive timer is specified.
356
Timer
Timer
Retentive
timer
Low-speed timer
High-speed timer
Low-speed retentive timer
High-speed retentive timer