Rockwell Automation 57C442 Data Highway Plus Interface Module - Manual (Page 35)

4-17
Example 1: Command 3, Word Range Read
In the example below, the Data Highway Plus Interface module is
reading 100 words from file N7:0 in the PLC at station address 0. The
data read is stored in the local B3 file. The variable B3BASE% is
defined in the rack configuration.
10 COMMON B3BASE% \! Represents the physical address of &
the starting register on the
&
Data Highway Plus module to be
read from
20 LOCAL DST% \! The address of the destination node &
on the local Data Highway Plus network
21 LOCAL STS% \! The location where the status
resulting from the operation is stored
22 LOCAL SZE% \! The number of registers to be &
transferred
23 LOCAL CMD% \! The Data Highway Plus command &
sent by the module
30 DST% = 0
31 STS% = 0
32 SZE% = 100
33 CMD% = 3
40 IF NOT GATEWAY_CMD_OK@(STS%, CMD%, DST%, “N7:0”, &
VARPTR!(B3BASE%), SZE%) THEN 20000 \! process errors &
at line 2000
Example 2: Command 4, Word Range Write
In the example below, the Data Highway Plus Interface module is
writing 100 words from the local N7 file to the file address N10:10 in the
PLC at station address 0. The variable N7BASE% is defined in the rack
configuration.
10 COMMON N7BASE% \! Represents the physical address of &
the starting register on the
&
Data Highway Plus module to be &
written to
20 LOCAL DST% \! The address of the destination node
on the localData Highway Plus network
21 LOCAL STS% \! The location where the status &
resulting from the operation is stored
22 LOCAL SZE% \! The number of registers to be &
transferred
23 LOCAL CMD% \! The Data Highway Plus command sent
by The module
30 DST% = 0
31 STS% = 0
32 SZE% = 100
33 CMD% = 4
40 IF NOT GATEWAY_CMD_OK@(STS%, CMD%, DST%, “N10:10, &
VARPTR!(N7BASE%), SZE%) THEN 20000 \! process errors at&
line 20000