Mitsubishi Electric MELSEC iQ-R Series, Programming Manual

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19 CC-LINK INSTRUCTIONS
19.1 Reading Data from the Target Station
Processing details
• This instruction reads data of the specified number of points from the buffer memory area of the target station or the device
of its CPU module.
• From the master station, the instruction can be executed for the local, standby master, or intelligent device station. From the
local or standby master station, the instruction can be executed for the master, local, or standby master station.
• The following figure shows how the G(P).RIRD instruction operates during execution.
• The completion status of the G(P).RIRD instruction can be checked with the completion device (d2) and the completion
status indication device (d2)+1.
Precautions
• The monitoring time and the number of retries can be set with the following link special registers (SWs).
• The G(P).RIRD instruction can be concurrently executed from the master station for two or more local, standby master, or
intelligent device stations. Two or more dedicated instructions cannot be concurrently executed for a single station. Two or
more dedicated instructions, including those other than G(P).RIRD, cannot be concurrently executed from a local station
even for another station. If the next dedicated instruction is issued before completion of the preceding one that has started,
the next one will be ignored. Create the program so that the next dedicated instruction will start after the completion device
turns on, because processing of a dedicated instruction takes several scans until its completion.
Operation error

Data is read from the buffer memory area specified by (s)+2 and (s)+3 that is included in the station specified by (s)+1 or from the device of the CPU module.

The read data is stored in the receive buffer of the master station.

The read data is stored in the device specified by (d1) and later, and the device specified by (d2) is turned on.
• Completion device (d2)
This device turns on during END processing of the scan where the G(P).RIRD instruction completes, and turns off during the next END processing.
• Completion status indication device (d2)+1
This device turns on or off depending on the completion status of the G(P).RIRD instruction.
When completed successfully: The device remains off.
When completed with an error: The device turns on during END processing of the scan where the G(P).RIRD instruction completes, and turns off during the
next END processing.
• Monitoring time setting (SW0009)
• Setting of the number of retries for dedicated instruction (SW000B)
Error code
((s)+0) Description
4000H to 4FFFH  MELSEC iQ-R CPU Module User's Manual (Application)
B000H to BFFFH

MELSEC iQ-R CC-Link System Master/Local Module User's Manual (Application)
G(P).RIRD
(d1) (s)+2
(s)+3
Ô
Ó
Ó
Ò
Receive buffer Buffer memory
CPU module CPU module CC-Link local station CC-Link master station
[Own station] [Target station]