Allen-Bradley Logix5000 Reference Manual

Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 463
Program Control Instructions (JMP, LBL, JSR, RET, SBR, JXR, TND, MCR, UID, UIE, AFI, NOP, EOT, SFP, SFR, EVENT) Chapter 11
EXT_ROUTINE_CONTROL Structure
Mnemonic Data Type Description Implementation
ErrorCode SINT If an error occurs, this value identifies the error. Valid
values are from 0-255.
There are no predefined error codes. The developer
of the external routine must provide the error
codes.
NumParams SINT This value indicates the number of parameters
associated with this instruction.
Display only - this information is derived from the
instruction entry.
ParameterDefs EXT_ROUTINE_
PARAMETERS[10]
This array contains definitions of the parameters to
pass to the external routine. The instruction can pass
as many as 10 parameters.
Display only - this information is derived from the
instruction entry.
ReturnParamDef EXT_ROUTIN_
PARAMETERS
This value contains definitions of the return
parameter from the external routine. There is only
one return parameter.
Display only - this information is derived from the
instruction entry.
EN BOOL When set, the enable bit indicates that the JXR
instruction is enabled.
The external routine sets this bit.
ReturnsValue BOOL 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.
Display only - this information is derived from the
instruction entry.
DN BOOL The done bit is set when the external routine has
executed once to completion.
The external routine sets this bit.
ER BOOL The error bit is set if an error occurs. The instruction
stops executing until the program clears the error bit.
The external routine sets this bit.
FirstScan BOOL 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.
The controller sets this bit to reflect scan status.
EnableOut BOOL Enable output. The external routine sets this bit.
EnableIn BOOL Enable input. 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.
User1 BOOL These bits are available for the user. The controller
does not initialize these bits.
Either the external routine or the user program can
set these bits.
User0 BOOL
ScanType1 BOOL These bits identify the current scan type:
Bit Values: Scan Type:
00 Normal
01 Pre Scan
10 Post Scan (not applicable to relay
ladder programs)
The controller sets these bits to reflect scan
status.
ScanType0 BOOL

Allen-Bradley Logix5000 Specifications

General

Brand	Allen-Bradley
Model	Logix5000
Category	Controller
Language	English