DL06 Micro PLC User Manual, 3rd Edition, Rev. E
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Chapter 5: Standard RLL Instructions
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MRX Example
DL06 port 2 has two Special Relay contacts associated with it (see Appendix D for comm
port special relays). One indicates “Port busy”(SP116), and the other indicates ”Port
Communication Error”(SP117). The “Port Busy” bit is on while the PLC communicates with
the slave. When the bit is off, the program can initiate the next network request. The “Port
Communication Error” bit turns on when the PLC has detected an error. Use of this bit is
optional. When used, it should be ahead of any network instruction boxes, since the error bit
is reset when an MRX or MWX instruction is executed. Typically, network communications
will last longer than 1 CPU scan. The program must wait for the communications to finish
before starting the next transaction.
NOTE: See Chapter 4, page 4-21, for an RLL example using multiple Read and Write interlocks with
MRX/MWX instructions.
