PROFIBUS INTERFACE
83
5
If the Master believes that the handshaking has gotten out of synch, it can request a
resynchronization, by setting
Bit 2
of the
Output Buffer Control Byte (
the
OBCB)
and then
also setting the same bit in the
Output Buffer Data Consistency Byte
(the
OBDCB
).
NOTE
Bit 2 is not a toggle – It is always set to 1 to begin a resynchronization
process, and cleared later to acknowledge that the process is complete.
(See the
Green
changes below)
Output Buffer
Input Buffer
Byte # Value
Byte # Value
00:
84
Output Buffer Control Byte
(OBCB)
7 6 5 4 3 2 1 0
[1] [0] [0] [0] [0]
[1]
[0] [0]
00
82
Input Buffer Control Byte
(IBCB)
7 6 5 4 3 2 1 0
[1] [0] [0] [0] [0] [0] [1] [0]
01: 00 (Always
0)
01: 00
02:
06
(Packet length in bytes)
02:
00
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
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:
84
Data Consistency Byte (OBDCB)
31: 82
Data Consistency Byte (IBDCB)
Summary of Contents for GWY-01-PBS-01
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