Rockwell Automation 57C329 Remote I/O Communications, AutoMax - Manual (Page 76)

4Ć14
RIONET_OK should be included in the READY sequence. It is set by
the BASIC task shown in 4.7.2.3. Note that the trailing at" symbol
(@) is not used for Boolean variables in ladder logic tasks.
4.7.2.3 BASIC Task Example
The following is an example of a BASIC task for the Remote I/O
network in figure 4.4. The task is composed of three main sections.
The first section, lines 1300 to 1500, checks to see if network drops 2
and 4 are recognized by the master. If they are not recognized, the
program will continue to loop until they are. The second section, lines
2400 to 2500, configures drop 2. This is done by writing to variable
D02_CFG%, the configuration register. Once the configuration word
has been written, the configuration ready bit (10) is set. Note that
drop 4 does not need to be configured in this way since it is an all
digital rack. The last section of the task, lines 3300 to 3700, simply
writes the analog input value SPD_REF% to indicator SPD_IND%. If
either drop 2 or drop 4 malfunctions, the program will go to line 300
and wait for the affected drop to recover.
10 !
20 ! Shark RIO BASIC Example
30 !
100 COMMON RIO_D02@
200 COMMON RIO_D04@
300 COMMON SPD_REF%
400 COMMON SPD_IND%
500 COMMON RUN@
600 COMMON RIONET_OK@
700 COMMON D02_CFG@
800 COMMON D02_CFG_RDY@
1000 !
1100 !ąăWait for slave drops to come onĆline. The program will
1200 !ąăloop until drops two and four come onĆline.
1300 RIONET_OK@ = FALSE \ SPD_IND% = 0
1400 DELAY 1 TICKS
1500 IF NOT (RIO_D02@ AND RIO_D04@) THEN GOTO 1400
1600 !
1700 !ąConfigure Shark Remote I/O racks
1800 !ąDrop 4 is an all digital rack and does not need to be
1900 !ąąconfigured
2000 !ąDrop 2 is a mixed rack. By default slots are configured
2100 !ąąas analog. Configure slot 5 as digital and set
2200 !ąąthe configuration ready bit (15).
2300 !
2400 D02_CFG% = 20H \!Set the configuration word
2500 D02_CFG_RDY@ = TRUE \!Set the configuration complete bit
2600 !
2700 !ąSet RIO ready for pc task
2800 !
2900 RIONET_OK@ = TRUE
3000 !
3100 !ąTask loop
3200 !
3300 IF NOT RUN@ THEN SPD_IND% = 0 \ GOTO 3500
3400 SPD_IND% = SPD_REF%
3500 IF NOT (RIO_D02@ AND RIO_D04@) THEN GOTO 1300
3600 DELAY 1 TICKS
3700 GOTO 3300
3800 END
The symbolic names defined as COMMON" reference the I/O points
defined in the configuration for the Remote I/O network.