DL205 User Manual, 4th Edition, Rev. D
5-182
Chapter 5: Standard RLL Instructions
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A
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D
Goto Subroutine (GTS) (SBR)
The Goto Subroutine instruction allows a section of ladder
logic to be placed outside the main body of the program
and execute only when needed. There can be a maximum
of 128 GTS instructions and 64 SBR instructions used in
a program. The GTS instructions can be nested up to 8
levels. An error E412 will occur if the maximum limits
are exceeded. Typically this will be used in an application
where a block of program logic may be slow to execute and
is not required to execute every scan. The subroutine label
and all associated logic is placed after the End statement in
the program. When the subroutine is called from the main
program, the CPU will execute the subroutine (SBR) with
the same constant number (K) as the GTS instruction that
called the subroutine.
By placing code in a subroutine, it is only scanned and
executed when needed since it resides after the End
instruction. Code which is not scanned does not impact
the overall scan time of the program.
Subroutine Return (RT)
When a Subroutine Return is executed in the subroutine,
the CPU will return to the point in the main body of the
program from which it was called. The Subroutine Return
is used as termination of the subroutine, which must be
the last instruction in the subroutine and is a stand-alone
instruction (no input contact on the rung).
Subroutine Return Conditional (RTC)
The Subroutine Return Conditional instruction is
an optional instruction used with an input contact to
implement a conditional return from the subroutine. The
Subroutine Return (RT) is still required for termination
of the Subroutine.
K aaa
GTS
230
240
250-1
260




K aaa
SBR
RT
230
240
250-1
260




RTC
230
240
250-1
260




Operand Data Type DL240 Range DL250-1 Range DL260 Range
aaa aaa aaa
Constant K 1-FFFF 1-FFFF 1-FFFF
DS Used
HPP Used
DS Used
HPP Used
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