Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1124

Precautions
• When executing multiple SP.SLMPSND instructions concurrently, be careful not to overlap the channels of the
SP.SLMPSND instructions. Multiple SP.SLMPSND instructions specifying the same channels cannot be used concurrently.
When the execution conditions of the SP/SLMPSND instructions in the same channel are satisfied in the same sequence
scan, only the SP/SLMPSND instruction that has been executed first is enabled and the subsequent SP/SLMPSND
instructions are not executed. In addition, any subsequent SP.SLMPSND instruction of the same channel setting as the
SP.SLMPSND instruction being executed is not executed. If the CPU module does not execute the processing of the
SP.SLMPSND instruction, SM699 turns on.
• Specify the arrival monitoring time ((S1)+11) of the control data and monitoring timer ((S2)+1) of the request frame so that
the arrival monitoring timemonitoring timer.
CPU module
(s1)+11
(1) Request message
(2) Processing request from external device to request destination
(3) Processing response from request destination to external device
(4) Response message
The SP.SLMPSND instruction is successfully completed even if the target device returns an abnormal
response. When the SP.SLMPSND instruction is completed successfully, the response is whether normal or
abnormal can be identified by the end code of the response frame. When an abnormal response is returned,
check the manual of the SLMP-compatible device being used and take corrective action.
Operation error
Error code Description
(SD0)
3405H The value set to (s1)+2 as own station channel is out of the range, 1 to 9.
The value set to (s2)+0 as the request data length is 0 or exceeds 2000.
Upon completion with an error, the completion status indication device (d2)+1 is turned on and an error code is stored in the
completion status (s1)+1. For the error code stored in the completion status (s1)+1, refer to the following.
 MELSEC iQ-R Ethernet User's Manual (Application)
8 BUILT-IN ETHERNET FUNCTION INSTRUCTIONS
1122
8.4 SLMP Frame Send Instruction
External device
(1)
(2)
(s2)+1
(3)
(4)
Request
destination