Mitsubishi Electric M800VW Series Programming Manual page 632

M800V/M80V Series PLC Programming Manual (2/2)
14 PLC Help Function
14.10 Arbitrary Reverse Run
Restrictions
 A buffer correction to the block for the reverse/forward run is not allowed in the reverse run control (reverse/forward run).
The buffer correction is available to the blocks after the block where the reverse run starts.
 If a collation and stop has been executed in the normal operation, a reverse run control (reverse/forward run) stops at the
verification point in the block. On the other hand, if no collation and stop has been executed in the block in the normal oper-
ation, the collation and stop cannot be executed at the verification point specified during the reverse run control.
 Execute a scaling (G51) command before turning ON the "Reverse run control mode" signal. If the command is executed
during the reverse run, the movement stops and stays at the reverse run start point in the block before the scaling com-
mand.
Stays stopped
Reverse run
 Corner R/C, linear angle command and geometric command are not successfully executed during the reverse run. Corner
R/C stays stopped before the corner.
Stays stopped
before the corner
Reverse run
 The consecutive number of "blocks with no movement" must be 7 or less in the program to be executed in the reverse run
control mode. When containing 8 or more blocks, insert "G04;" (dwell) before the 8th block. When the number of "blocks
with no movement" reaches 8 in a row in the reverse run control mode, the alarm "M01 Reverse run impossible 0119"
occurs.
 Be sure to insert a "G04;" (dwell) block before G92, G52 and G53 commands.
 When using a sub program in the program executed in the reverse run control mode, insert a G04;(dwell) block before each
block of sub program call (M98) and sub program return (M99).
 This function cannot be used with the reference position retract. Turning ON the "Reference position retract" (RTN) signal
in the reverse run control mode clears the reverse run information.
 "M code independent output" (M00, M01, M02 and M30) signals are not output in the reverse run.
 Only the linear-type rotary axis can be under the reverse run control.
Scaling ON
Scaling canceled
Corner C
611
N01 G90 X - 10. ;
N02 Y - 10. ;
N03 G51 X - 10. Y - 10. P2. ;
N04 X - 20. ;
N05 Y - 20. ;
N06 G50 ;
N06 X - 30. ;
N07 Y - 30. ;
N06 X - 40. ;
N07 Y - 40. ;
M02 ;
N01 G91 X - 100. ;
N02 Y - 100. ;
N03 X - 100. ,C10. ;
N04 Y - 100. ;
M02 ;
IB-1501668-B