Balluff BIS M-370-000-A02, Manual, Page: 172 / 198

PROFIBUS INTERFACE
165
9
When the slave sees Bit 2 In the OBCB & OBDCB set, it knows it needs to resynchronize its
handshaking bits in the IBCB & IBDCB.
So the Slave will acknowledge the resynchronization request by setting
Bit 2, and will clear
Bit 1 and Bit 0 in the IBCB & IBDCB .
Note that whatever values Bit 1 or Bit 0 had, they will be set to 0. This process forces the
handshaking into a known state.
(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
84
Input Buffer Control Byte
(IBCB)
7 6 5 4 3 2 1 0
[1] [0] [0] [0] [0]
[1] [0] [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: 84 Data Consistency Byte (IBDCB)