Ext_Routine_Control Structure - Allen-Bradley Logix5000 Reference Manual

Program Control Instructions (JMP, LBL, JSR, RET, SBR, JXR, TND, MCR, UID, UIE, AFI, NOP, EOT, SFP, SFR, EVENT)
Mnemonic Data Type
ErrorCode SINT
NumParams SINT
ParameterDefs EXT_ROUTINE_
PARAMETERS[10]
ReturnParamDef EXT_ROUTIN_
PARAMETERS
EN BOOL
ReturnsValue BOOL
DN BOOL
ER BOOL
FirstScan BOOL
EnableOut BOOL
EnableIn BOOL
User1 BOOL
User0 BOOL
ScanType1 BOOL
ScanType0 BOOL

EXT_ROUTINE_CONTROL Structure

Description
If an error occurs, this value identifies the error. Valid
values are from 0-255.
This value indicates the number of parameters
associated with this instruction.
This array contains definitions of the parameters to
pass to the external routine. The instruction can pass
as many as 10 parameters.
This value contains definitions of the return
parameter from the external routine. There is only
one return parameter.
When set, the enable bit indicates that the JXR
instruction is enabled.
If set, this bit indicates that a return parameter was
entered for the instruction. If cleared, this bit
indicates that no return parameter was entered for
the instruction.
The done bit is set when the external routine has
executed once to completion.
The error bit is set if an error occurs. The instruction
stops executing until the program clears the error bit.
This bit identifies whether this is the first scan after
switching the controller to Run mode. Use FirstScan
to initialize the external routine, if needed.
Enable output.
Enable input.
These bits are available for the user. The controller
does not initialize these bits.
These bits identify the current scan type:
Bit Values: Scan Type:
00 Normal
01 Pre Scan
10 Post Scan (not applicable to relay
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Implementation
There are no predefined error codes. The developer
of the external routine must provide the error
codes.
Display only - this information is derived from the
instruction entry.
Display only - this information is derived from the
instruction entry.
Display only - this information is derived from the
instruction entry.
The external routine sets this bit.
Display only - this information is derived from the
instruction entry.
The external routine sets this bit.
The external routine sets this bit.
The controller sets this bit to reflect scan status.
The external routine sets this bit.
The controller sets this bit to reflect rung-
condition-in. The instruction executes regardless
of rung condition. The developer of the external
routine should monitor this status and act
accordingly.
Either the external routine or the user program can
set these bits.
The controller sets these bits to reflect scan
status.
ladder programs)
Chapter 11
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