SI-INTERBUS User Guide
53
Issue Number: 1
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Table 8-16 PPO 4 Word Write TASK ID and RESPONSE ID combinations
PPO 4 Word write request example
shows an example set of data words
for PPO 4 Word mode. This example will write a value of 1553.9 rpm (32-bit value is
15539) to the digital speed reference 1 (Pr
1.021
) to the drive.
Table 8-17 PPO 4 Word write request example
PPO 4 Word write response example
shows an example of a successful
write response to the write instruction illustrated above in Table 8-17.
Table 8-18 PPO 4 Word write response example
Function
TASK ID
RESPONSE ID
Message Status
No task
0
0
No non-cyclic transaction active.
Transfer parameter
value (16-bit)
7
4
Parameter value (16-bit) written
successfully.
Transfer parameter
value (32-bit)
8
5
Parameter value (32-bit) written
successfully.
Transfer parameter
value (16-bit)
7
7
TASK ID 7 could not be executed.
Check the error code in IN word 3 for the
reason why.
Transfer parameter
value (32-bit)
8
7
TASK ID 8 could not be executed.
Check the error code in IN word 3 for the
reason why.
Transfer parameter
value (32-bit)
8
8
Parameter is read-only and cannot be
written to.
OUT Data
Word
Hex
Value
Function
b15 to b12
b11
b10 to b8
b7 to b0
OUT Word 0
0x8001
TASK ID = 8
0
MENU = 1
OUT Word 1
0x1500
PARAMETER = 21
0
OUT Word 2
0x0000
DATA HIGH word = 0
OUT Word 3
0x3CB3
DATA LOW word = 15539
OUT Data
Word
Hex
Value
Function
b15 to b12
b11
b10 to b8
b7 to b0
IN Word 0
0x5001
RESPONSE ID = 5
0
MENU = 1
IN Word 1
0x1500
PARAMETER = 21
0
IN Word 2
0x0000
DATA HIGH word = 0
IN Word 3
0x3CB3
DATA LOW word = 15539
If the PPO 4 Word command is left in the data words, the write will be executed on every
poll of the network, effectively providing a continuous write. Care should be taken to
ensure the parameters for the write are setup before the TASK ID is changed from 0 to
prevent incorrect data being written.
NOTE
NOTE
