Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 323)

Publication 1785-UM012D-EN-P - July 2005
Instruction Set Quick Reference D-23
Jump to Subroutine
JSR If the input conditions are true, the controller starts running a
subroutine Program File (90). The controller passes the Input
Parameters (N16:23, N16:24, 231) to the subroutine and the RET
instruction passes Return Parameters (N19:11, N19:12) back to
the main program, where the controller encountered the JSR
instruction.
Subroutine
SBR The SBR instruction is the first instruction in a subroutine file.
This instruction identifies Input Parameters (N43:0, N43:1,
N43:2) the controller receives from the corresponding JSR
instruction. You do not need the SBR instruction if you do not
pass input parameters to the subroutine.
Return
RET If the input conditions are true, the RET instruction ends the
subroutine and stores the Return Parameters (N43:3, N43:4) to
be returned to the JSR instruction in the main program.
Always False
AFI The AFI instruction disables the rung (i.e., the rung is always
false).
Temporary End
TND If the input conditions are true, the TND instruction stops the
controller from scanning the rest of the program (i.e., this
instruction temporarily ends the program).
One Shot
ONS If the input conditions preceding the ONS instructions on the
same rung go from false-to-true, the ONS instruction conditions
the rung so that the output is true for one scan. The rung is
false on successive scans.
See page F-8 for a description of prescan operation for
this instruction.
One Shot Falling
OSF
Status Bits:
OB - Output Bit
SB - Storage Bit
The OSF instruction triggers an event to occur one time. Use the
OSF instruction whenever an event must start based on the
change of state of a rung from true-to-false, not on the resulting
rung status. The output bit (N7:0/15) is set (1) for one program
scan when the rung goes from true-to-false.
See page F-8 for a description of prescan operation for
this instruction.
One Shot Rising
OSR
Status Bits:
OB - Output Bit
SB - Storage Bit
The OSR instruction triggers an event to occur one time. Use
the OSR instruction whenever an event must start based on the
change of state of a rung from false-to-true, not on the resulting
rung status. The output bit (N7:0/15) is set (1) for one program
scan when the rung goes from false-to-true.
See page F-8 for a description of prescan operation for
this instruction.
Instruction Description
JSR
JUMP TO SUBROUTINE
Program File
Input par
90
N16:24
N16:23
231
Input par
Input par
Return par
Return par
N19:11
N19:12
SBR
SUBROUTINE
Input par N43:1
N43:0
N43:2
Input par
Input par
RET
RETURN ( )
Return par N43:4
N43:3 Return par
AFI
( ) TND
B3
110
ONS
OSF
ONE SHOT FALLING
Output Bit 15
B3/0
N7:0
Storage Bit
Output Word
OSR
ONE SHOT RISING
Output Bit 15
B3/0
N7:0
Storage Bit
Output Word