Mitsubishi Electric MELSEC iQ-R Series - Edge Relay (V); Step Relay (S)

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27 DEVICES
27.3 User Device
Edge relay (V)
The edge relay is a device that memorizes operation results (on/off information) from the head of the ladder block, allowing its
use only by the EGP/EGF instruction. This device is executed for various objectives such as the rising (from off to on)
detection in the structured programs by the index modification.
*1 Edge relay V0Z1 memorizes on/off information of X0Z1.
Step relay (S)
This device is used when specifying SFC program steps. This device is also used when specifying step No. through such
methods as verifying (monitor, current value changes) SFC programs with SFC control instructions or the engineering tool.
( MELSEC iQ-R Programming Manual (Program Design))
This device is designed only for SFC programs, and cannot be used as a substitute for an internal relay in a
sequence program. If it is used, an error may occur, causing a system failure.
(1) When X1 is rising, this device is turned on for one scan duration.
SM400
X0Z1
V0Z1
SM400
*1 *1
MOV K0 Z1
FOR K10
M0Z1
INC Z1
NEXT
Return to the FOR instruction.
Clear the index register (Z1).
Specify the number of repeats
(10 times).
Turn on M0Z1 for 1 scan by the
rise of X0Z1.
Increment (+1) of the index
register (Z1)
X0
M0
V0
X1
M1
V1
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
(1)
Z1 = 0
Z1 = 1
1 scan
1 scan