Rockwell Automation 1336T PLC Comm. Adapter, Series B, FRN 2.xx-3.xx - Manual (Page 59)

3–15
Publication 1336 FORCE–5.13 –– September, 1998
The following programs are examples of block transfer programming
for the PLC Communications Adapter Board.
The BTW AVAIL,
BTR AVAIL, and BT ERROR bits from the module status word
(I:020 in these examples) are used in these examples. The examples
also show how you can use user logic to enable or disable the block
transfer operations.
Keep in mind that it is the header message for the BTW that defines
if data is to be written to or read from the drive. Refer to Chapter 7,
Block Transfer Services, for a complete listing of message structures.
The following program is for a PLC5/15 or 5/25.
14
12
(EN)
(DN)
(ER)
End of File
12 15
(EN)
(DN)
(ER)
Rung 2:1
Rung 2:3
00
(CU)
(DN)
Rung 2:2
User
Logic
I:000
BT
Read
Available
BTR AVAIL
I:020
BTW
BTR
CTU
BTU Error Counter
Group
Rack
Control Block
Data File
Length
Continuous
Module
BLOCK TRANSFER WRITE
02
0
0
N10:10
64
N
N10:0
BT
Error
I:020
BT
Read
Available
BTR AVAIL
I:020
BT
Write
Available
BTW AVAIL
I:020
14
BT
Error
BT ERROR
I:020
Group
Rack
Control Block
Data File
Length
Continuous
Module
BLOCK TRANSFER READ
02
0
0
N10:90
64
N
N10:80
Preset
Counter
Accum
Count Up
C11:0
32767
0
Rung 2:0
PLC–5 Block Transfer
Rung Example