Balluff BIS M-370-000-A02, Manual, Page: 160 / 198

PROFIBUS INTERFACE
153
9
Now that the first command fragment is in the Output Buffer, the Master alerts the Slave that
the command fragment is ready. It does this by toggling
Bit 1 of the OBCB & OBDCB .
Since there are more command fragments to follow to complete the command, the Master
also sets
Bit 3 of the OBCB & OBDCB to 1. This bit is what tells the Slave to wait for further
fragments before processing the command.
(See the
Green changes below)
Output Buffer Input Buffer
Byte # Value Byte # Value
00:
8A
Output Buffer Control Byte
(OBCB)
7 6 5 4 3 2 1 0
[1] [0] [0] [0]
[1] [0] [1] [0]
00
80
Input Buffer Control Byte
(IBCB)
7 6 5 4 3 2 1 0
[1] [0] [0] [0] [0] [0] [0] [0]
01: 00 (Always 0) 01: 00
02: 1C (Packet length in bytes) 02: 00
03:
04:
05:
06:
07:
08:
09:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30: 00
1F
AA
06
00
01
03
E8
00
00
00
32
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56 (CBx Command word length MSB)
(CBx Command word length LSB)
(CBx Command Type) Always AA
(CBx Command Opcode)
0x06 = Write Tag Data
(CBx Command, byte not used)
(CBx Command “Node ID”)
(CBx Command Timeout MSB)
(CBx Command Timeout LSB)
0xE8 = 1000 ms timeout
(CBx Command Start Address MSB)
(CBx Command Start Address LSB)
address 0
(CBx Command Length MSB)
(CBx Command Length LSB)
50 bytes
(CBx Command Data Byte 1)
(CBx Command Data Byte 2)
(CBx Command Data Byte 3)
(CBx Command Data Byte 4)
(CBx Command Data Byte 5)
(CBx Command Data Byte 6)
(CBx Command Data Byte 7)
(CBx Command Data Byte 8)
(CBx Command Data Byte 9)
(CBx Command Data Byte 10)
(CBx Command Data Byte 11)
(CBx Command Data Byte 12)
(CBx Command Data Byte 13)
(CBx Command Data Byte 14)
(CBx Command Data Byte 15)
(CBx Command Data Byte 16) 03:
04:
05:
06:
07:
08:
09:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
..
30: 00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
..
00
31:
8A Data Consistency Byte (OBDCB)
31: 80
Data Consistency Byte (IBDCB)