Serial Communications 8-13
1560D-UM051D-EN-P – February 2005
Software Configuration Settings (cont.)
3.
[F6], MODIFY G-FILE (cont.)
Word 2, Primary/Normal Device Logical Image Size – Specifies the
logical image size (amount of scanner I/O image) of the devices set in
Word 1. As with Word 1, these bits correspond to RIO logical rack
and logical group numbers. To specify image size (in binary mode), you
enter a 1 at each group a device occupies. (This SMC Dialog example
is using 1/4 rack size, Word G1/33 = 1.)
Word 3 and Word 4 refer to Complementary I/O Configuration (if
G-File size is set to 5), which is not used in this sample application.
Please reference the RIO Scanner User Manual (Publication 1747-6.6)
and the Advanced Programming Software (APS) User Manual
(Publication 1746-6.4) for further information on any of the above
settings or operations.
SLC 500 Ladder Logic Program
Terms used: BT Block Transfer
BTR Block Transfer Read
BTW Block Transfer Write
The sample ladder logic program that follows performs a consecutive
parameter value read of the SMC Dialog Plus™ controller's metering
group (parameters 1-11) by using a BTW/BTR pair. The BTW operation
defines to the Bulletin 1203 communication module the type of parameter
read/write operation ("Continuous Parameter Value Read" for this example)
and identifies the parameter to be polled. Execution of the BTR operation
allows the communication module to respond, providing the requested data.
Notes: 1. The ladder-logic program does not contain error checking
and handling. Refer to the SLC 500 and 1747-SN scanner
manuals for this documentation.
2. For this example, Allen-Bradley's APS programming software
is used.
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