719
High-speed Counter/Pulse Output Instructions Section 3-20
3-20-4 REGISTER COMPARISON TABLE: CTBL(882)
Purpose CTBL(882) is used to register a comparison table and perform comparisons
for a high-speed counter PV. Either target value or range comparisons are
possible. An interrupt task is executed when a specified condition is met.
Ladder Symbol
Variations
Applicable Program Areas
Operands P: Port Specifier
P specifies the port for which pulses are to be counted as shown in the follow-
ing table.
C: Control Data
The function of CTBL(882) is determined by the control data, C, as shown in
the following table.
TB: First Table Comparison Word
TB is the first word of the comparison table. The structure of the comparison
table depends on the type of comparison being performed.
For target value comparison, the length of the comparison table is determined
by the number of target values specified in TB. The table can be between 4
and 145 words long, as shown below.
CTBL(882)
P
C
TB
P: Port specifier
C: Control data
TB: First comparison table word
Variations Executed Each Cycle for ON Condition CTBL(882)
Executed Once for Upward Differentiation @CTBL(882)
Executed Once for Downward Differentiation Not supported
Immediate Refreshing Specification Not supported
Block program areas Step program areas Subroutines Interrupt tasks
OK OK OK OK
PPort
0000 hex High-speed counter 0
0001 hex High-speed counter 1
0002 hex High-speed counter 2
0003 hex High-speed counter 3
C CTBL(882) function
0000 hex Registers a target value comparison table and starts comparison.
0001 hex Registers a range comparison table and performs one comparison.
0002 hex Registers a target value comparison table. Comparison is started with INI(880).
0003 hex Registers a range comparison table. Comparison is started with INI(880).
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