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Manual – MOVI-PLC® advanced DHF41B DeviceNet and PROFIBUS DP-V1 Fieldbus Interfaces
6
Process data exchange
DeviceNet Operating Characteristics
Bit-strobe I/O
The SEW fieldbus device profile does not include the bit-strobe I/O messages. The
messages represent a DeviceNet-specific process data exchange. The master sends a
broadcast message that is 8 bytes (= 64 bits) long. One bit in this message is assigned
to each station in accordance with its address. The value of this bit may be 0 or 1,
triggering two different responses in the recipient.
The following table shows the data range of the bit-strobe request message which
represents the allocation of stations (= station address) to data bits.
Example: For example, the participant with station address (MAC-ID) 16 only processes
bit 0 in data byte 2.
Bit
value
Meaning
LED BIO
0
Sends back process input data only
Green light
1
Trigger fieldbus timeout reaction and send back process input data
Flashing red
NOTICE
The LED L14 (BIO) on the front of the UFF41B option can be used for distinguishing
between the timeout triggered by the bit-strobe telegram and a real timeout in the
connection. The LED L14 (BIO) lights up green when bit-strobe messages are received
cyclically.
LED L14 (BIO) flashing red means there is a timeout in the bit-strobe connection and
no more bit-strobe telegrams are accepted. Each participant that has received this bit-
strobe I/O message responds with its current process input data. The length of the
process input data corresponds to the process data length for the polled I/O
connection. The process input data length can be up to four process data.
Byte
offset
7
6
5
4
3
2
1
0
0
ID 7
ID 6
ID 5
ID 4
ID 3
ID 2
ID 1
ID 0
1
ID 15
ID 14
ID 13
ID 12
ID 11
ID 10
ID 9
ID 8
2
ID 23
ID 22
ID 21
ID 20
ID 19
ID 18
ID 17
ID 16
3
ID 31
ID 30
ID 29
ID 28
ID 27
ID 26
ID 25
ID 24
4
ID 39
ID 38
ID 37
ID 36
ID 35
ID 34
ID 33
ID 32
5
ID 47
ID 46
ID 45
ID 44
ID 43
ID 42
ID 41
ID 40
6
ID 55
ID 54
ID 53
ID 52
ID 51
ID 50
ID 49
ID 48
7
ID 63
ID 62
ID 61
ID 60
ID 59
ID 58
ID 57
ID 56
0
0
I
Summary of Contents for DHF41B
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