Fifo Trigger - Mitsubishi MELSEC-Q EQ-V680D1 User Manual

6. HOW TO COMMUNICATE WITH ID TAGS

6.3.4 FIFO trigger

ID instruction execution request (Y14, Y1C)
ID-BUSY(X3, XB)
ID instruction complete (X4, XC)
Result reception (Y16, Y1E)
ID communication complete (X2, XA)
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With the FIFO trigger communication specification, communication is performed while
the ID tag is stopped within the antenna communication area.
1. When the ID instruction execution request (Y14, Y1C) is turned ON, communication
with the operable ID tag is started.
2. After communication with the ID tag ends, operation of the ID tag is disabled, and ID
instruction complete (X4, XC) turns ON.
3. When the ID instruction execution request (Y14, Y1C) is turned OFF, ID instruction
complete (X4, XC) turns OFF, and the module changes to a standby state.
4. When an operable ID tag does not exist within the antenna communication area the
moment the ID instruction execution request (Y14, Y1C) is turned ON, error
detection (X5, XD) turns ON.
5. With the FIFO trigger communication specification, communication is possible if
there is one operable ID tag among the ID tags within the antenna communication
area. When two or more operable ID tags exist, communication cannot be
performed normally and error detection (X5, XD) turns ON.
ID tag C
Error detection (X5, XD)
Communication with ID tag
(Movement of ID tag A)
(Movement of ID tag B)
(Movement of ID tag C)
ID tag B
ID tag A
Communication Communication
Within
Operation disabled
communication area
Within
communication area
When the ID instruction execution request is
turned ON, communication is performed with
an operable ID tag that exists within the
communication area. When an operable ID
tag is not present, a tag not present error
occurs.
The operation of an ID tag that
completed communication is disabled.
When the ID tag moves outside the
communication area, the operation
disabled status is cleared.
Communication area
Tag not present error
No
detection
Operation disabled
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