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Subroutines Section 3-18
3-18-6 GLOBAL SUBROUTINE ENTRY: GSBN(751)
Purpose Indicates the beginning of the global subroutine program with the specified
subroutine number. Used in combination with GRET(752) to define a global
subroutine region.
GSBN(751) is used in combination with GSBS(750) and GRET(752), the
GLOBAL SUBROUTINE CALL and GLOBAL SUBROUTINE RETURN
instructions.
Ladder Symbol
Variations
Applicable Program Areas
Operands N: Global subroutine number
Specifies the global subroutine number between 0 and 255 decimal.
Operand Specifications
Description GSBN(751) indicates the beginning of the global subroutine with the specified
subroutine number. The end of the subroutine is indicated by GRET(752).
The region of the program beginning at the first GSBN(751) instruction is the
subroutine region. A subroutine is executed only when it has been called by
GSBS(750).
The global subroutine region (between GSBN(751) and GRET(752)) must be
defined in interrupt task 0. If it is defined in another task, an error will occur
and the Error Flag will be turned ON when the GSBS(750) instruction is exe-
cuted.
GSBN(751)
N
N: Global subroutine number
Variations Executed Each Cycle for ON Condition GSBN(751)
Immediate Refreshing Specification Not supported
Block program areas Step program areas Subroutines Interrupt tasks
Not allowed Not allowed --- OK
Area N
CIO Area ---
Work Area ---
Holding Bit Area ---
Auxiliary Bit Area ---
Timer Area ---
Counter Area ---
DM Area ---
Indirect DM addresses
in binary
---
Indirect DM addresses
in BCD
---
Constants 0 to 255 (decimal)
Data Registers ---
Index Registers ---
Indirect addressing
using Index Registers
---
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