Mitsubishi Electric M800VW Series Programming Manual page 633

M800V/M80V Series PLC Programming Manual (2/2)
14 PLC Help Function
14.10 Arbitrary Reverse Run
 Do not turn ON/OFF the "Optional block skip" (BDTn) signal under the reverse run control (in the reverse/forward run). The
path after the change is the same as in the normal operation.
 The axis movement, which has been executed in other modes than memory and MDI modes (in MDI interrupt, manual
operation or macro interrupt for example) under the reverse run control, must be returned before the reverse run starts.
Unless the movement is returned, the reverse run of the program starts with the current position regarded as end point of
the last block that has been executed in the memory or MDI mode.
 Tool life is not changed by the reverse run control (reverse/forward run).
 The reverse run control cannot be used with the PLC interrupt. Do not use the "PLC interrupt" (PIT) signal under the
reverse run control.
Using macro interrupt
 Outline
The macro interrupt function helps starting the reverse run in the middle of the block.
Using the macro interrupt, which employs a user macro function, will be useful when a tool has broken: this helps moving the
tool from where it has broken to the point where the tool is changed, and then returning it to the program path after the tool
change.
An interrupt program has to instruct to move the tool to the tool change position, as well as to return it to the program path.
Use the parameter "#1113 INT_2" (Interrupt type 2 validity) to decide where to interrupt. Set "0" to the parameter to execute
the macro interrupt in the middle of the block.
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