Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1695

Precautions
• The following table summarizes the processes that take place if another instruction is issued while the G(P).BIDIN
instruction is active or the G(P).BIDIN instruction is issued while another instruction is active with the same channel.
Instruction to execute
*2
concurrently
G(P).BIDOUT
G(P).BIDIN
ZP.CSET
G(P).PUTE
G(P).GETE
Z.BUFRCVS
G(P).SPBUSY
ZP.UINI
*2 The following instructions are not available with the same channel as for the G(P).BIDIN instruction because they use a communication
protocol different from the one used by this instruction. In addition, if these are used with the same channel as for the G(P).BIDIN
instruction, a communication protocol setting error (7FF2H) will occur.
• G(P).ONDEMAND, G(P).CPRTCL, G(P).OUTPUT, G.INPUT, and G(P).PRR instructions
Operation error
Error code Description
((s)+1)
7000H to 7FFFH  MELSEC iQ-R Serial Communication Module User's Manual (Application)
Possibility of Handling for concurrent execution
concurrent execution
 
 The instruction is ignored and does not start processing until the active instruction
completes.
Concurrent execution is, however, possible if they use different channels.

A dedicated instruction concurrent execution error (7FF0H) occurs in the second
instruction.
Concurrent execution is, however, possible if they use different channels.
 

Concurrent execution of the G(P).BIDIN and Z.BUFRCVS instructions is not possible.
Concurrent execution is, however, possible if they use different channels.
 

A dedicated instruction concurrent execution error (7FF0H) occurs in the second
instruction.
20 SERIAL COMMUNICATION INSTRUCTIONS
20.6 Receiving Data Using the Bidirectional Protocol
20
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