Mitsubishi Electric M800VW Series Programming Manual page 631

M800V/M80V Series PLC Programming Manual (2/2)
14 PLC Help Function
14.10 Arbitrary Reverse Run
S, T and 2nd miscellaneous function command in the reverse/forward run
In the reverse run, NC outputs an S command only upon a change of the modal value: the S command with the changed
modal value is output to "S code data" (R512 to R519) and then the "S function strobe" (SFn) signal is turned ON.
In the forward run, NC outputs S commands to "S code data" according to the program, and then turns ON the "S function
strobe" signal.
T command and 2nd miscellaneous command are also output only upon changes of the value: each code data is output and
each strobe signal is turned ON.
Program
S100;
S200;
S300;
Timing chart
Reverse/forward run with the "Reverse control mode" and "Reverse run" signals
Reverse run
control mode (RVMD)
Reverse run (VRV)
In automatic operation
"start" (STL)
Automatic operation
"start" command (ST)
Program execution
N
: Normal operation
R : Reverse run
F : Forward run
How the "Reverse run" signal works with the signals for the operation start
Reverse run (VRV)
Automatic operation
"start" command (ST)
In automatic operation
"start" (STL)
Do not turn OFF the signal STL when the reverse run has started.
IB-1501668-B
Reverse run
S100
S100
S200
S200
S300
Outputs upon modal changes
Reached to the reverse run start point
610
Forward run
S200
S300