Full duplex plc 3 line monitor example, Fullćduplex plcć3 line monitor example, Reply #1 (sometime later) – Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command User Manual
Page 238: Command #2, Reply #2 (sometime later), Command #3, Reply #3 (sometime later)
14–6
Line Monitor Examples
Publication 1770Ć6.5.16 - October 1996
In this example three word range reads (CMD 0F, FNC 01) are sent:
•
from a computer connected to a 1770-KF2 with DH node address
012 (octal)
•
to the PLC-3 connected to a 1775-KA with DH node address 011
(octal)
This example requires three commands and the corresponding replies
to read 684 bytes of data from the PLC-3 processor. The following
describes the first command and reply fields only. The fields of the
second and third commands and their replies are the same except for
the TNS, PACKET OFFSET, and BCC fields:
Command #1:
DLE STX DST SRC CMD STS TNS
ADDRRESS
SIZE
DLE ETX BCC
Path 1
10
02
09
00
0F
00
02
08
E4
10
03
6C
00
Path 2
DLE
ACK
10
06
Reply #1 (sometime later)
DLE STX DST SRC CMD STS TNS
DATA FROM PLCĆ3
DLE ETX BCC
Path 1
10
02
0A
09
4F
00
02
10
03
9C
00
Path 2
DLE ACK
10
06
0A
<<228 bytes of data>>
FNC
01
OFFSET
00
00
PACKET
TRANS
56
01
TOTAL
2C
00
Command #2
DLE STX DST SRC CMD STS TNS
ADDRRESS
SIZE
DLE ETX BCC
Path 1
10
02
09
00
0F
00
03
08
E4
10
03
F9
00
Path 2
DLE
ACK
10
06
Reply #2 (sometime later)
DLE STX DST SRC CMD STS TNS
DATA FROM PLCĆ3
DLE ETX BCC
Path 1
10
02
0A
09
4F
00
03
10
03
9B
00
Path 2
DLE ACK
10
06
0A
<<228 bytes of data>>
FNC
01
OFFSET
72
00
PACKET
TRANS
56
01
TOTAL
2C
00
Command #3
DLE STX DST SRC CMD STS TNS
ADDRRESS
SIZE
DLE ETX BCC
Path 1
10
02
09
00
0F
00
04
08
E4
10
03
86
00
Path 2
DLE
ACK
10
06
Reply #3 (sometime later)
DLE STX DST SRC CMD STS TNS
DATA FROM PLCĆ3
DLE ETX BCC
Path 1
10
02
0A
09
4F
00
04
10
03
9A
00
Path 2
DLE ACK
10
06
0A
<<228 bytes of data>>
FNC
01
OFFSET
E4
00
PACKET
TRANS
56
01
TOTAL
2C
00
FullĆduplex PLCĆ3 Line
Monitor Example