User Manual

Logic Functions - Book 2
SEQUENCE BLOCK
10-24
Syntax Errors:
ESTACK OVERFLOW 20 There was not sufficient evaluation stack to
complete the calculation.
INPUT NOT FOUND 21 One of the input operands was not found.
MISALIGNED OPERAND 22 Input operand token at odd address.
UNKNOWN OPERAND TYPE 23 Unknown data type found for input operand.
UNKNOWN CONSTANT TYPE 24 Unknown data type found for constant operand.
MISALIGNED CONSTANT 25 Multiple byte constant at odd address.
READ FROM EMPTY STACK 26 An operator was found with no operand(s)
remaining on the evaluation stack.
UNKNOWN OPERATOR 27 An unknown operator was found.
DATA TYPE VIOLATION 28 Operation is not allowed due to data type of
operand.
49
Error Position (EPOS)...........................................................................................................--R
This is the offset into the expression where the error was detected. This attribute applies to
configuration errors only.
50
Next Step (NEXT)...................................................................................................................--R
The step number of the current operating step plus one. The mnemonic NEXT can be used in
transition expressions to specify that the sequence is to advance from the current step to the
next sequential step.
100
External Step Source (XSTEPINP)................................................................................... CWR
This is an input value equal to the number of any configured step or zero (0). A value other
than zero specifies the step number to which the sequence is to be set. When the value is
zero, the block evaluates a transition expression to determine step progression. Writeable only
if local.
NONE Indicates the external step source is unused.
LSP Any external variable with a count data type.
Local Data Any local count type data.
101
Input 1 (I1).......................................................................................................................... CWR
through
201
Input 128 (I128).................................................................................................................. CWR
The input values are writeable only if the data is local. The user name for an input is an eight
(8) character alphanumeric used to identify the input in a transition expression. The default
names are I1 through I128. See 10.4.2 Input Definitions for additional information.
NONE Indicates an unused input
LSP Any external variable; any data type.
Local Data Any local data; any data type.