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Parameterization Message
Initialization bytes
Bytes 7 to 14 are referred to as the initialization bytes.
You can modify byte 7 (refer to Table C-3), the first byte of the eight initiali-
zation bytes, as follows:
Table C-3
0
1
2
3 to 5
6
7
1
The remaining bytes (byte 8 to byte 14) are pre-defined and cannot be modi-
fied. The values of these bytes are defined in Table C-4. If you modify these
values, the DP/ASi link cannot be operated.
Table C-4
Value
Control byte
The control byte (byte 15) contains the other interface parameters. The con-
trol byte has the value shown in Table C-5.
Table C-5
00
01
Actual equal to
"Actual is equal to setpoint configuration" means that the DP/ASi link starts
setpoint
up only when the actual configuration is the same as the setpoint configura-
configuration
tion. If there are any differences between the actual and setpoint configura-
tions, the DP/ASi link requests a new parameterization message.
C-4
Structure of byte 7 for initialization
Bit(s)
Meaning
Start bit monitoring
Stop bit monitoring
Watchdog time base
The time base = 1 ms may be used only for transmission rates
Default values of bytes 8 to 14 for initialization
Byte
8
9
10
00
00
82
H
H
Value of control byte (byte 15)
Value
Actual is equal to setpoint configuration
H
Actual is less than or equal to setpoint configuration
H
Value
0
Monitoring is enabled
1
Monitoring is disabled
0
Monitoring is enabled
1
Monitoring is disabled
0
Time base = 10 ms
1
1
Time base = 1 ms
0
In all cases
0
In all cases
0
In all cases
11
12
13
51
04
8A
H
H
H
Meaning
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b
1.5 MBd.
14
7D
H
H
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