Write Services - ABB Protronic 100 Manual

Description of the Write Service
The write service requires 8 bytes in the output data for the
request, and 6 bytes in the input data for the response.
structure is defined directly in the device database file as a
module. A write command is entered in the output data by setting
the bytes. The response is then returned in the input data. --
Output data (request) telegram:
Byte 0 Byte 1 Byte 2 Byte 3
Word 1
Service Polling Variable index
=0x10 number-
Service Polling Variable Variable
=0x10 number- index index
Lowbyte - Highbyte -
Table 7
Input data (response) telegram
Byte 0 Byte 1 Byte 2 Byte 3
Word 1
Service Polling Variable index
=0x10 number -
Service Polling Variable Variable
=0x10 number - index index
Lowbyte - Highbyte -
Table 8
The response becomes valid at the time when the polling number
has the same value in the response telegram as in the request
telegram. --
Description of the individual entries:
Entry Data type Description
Service Byte
Poll. number Byte
Variable
index 16-bit integer Index of variables that are to be
18 Operation
Byte 4 Byte 5 Byte 6
1 to 4 data bytes
1 to 4 data bytes
Byte 4 Byte 5
Status Error
Status Error
ID for write service (Index = 0x10).
This value can be entered once
before the first write job.- It is not
necessary to make an entry for
every write service to start. --
When this value is changed, the
write job will be executed. - As
long as this value remains
unchanged, the write job is not
executed any longer. -- Value 0 is
permissible.- It is useful to activate
a write job by incrementing the
value by 1. - A one byte overflow
from 0xFF to 0x00 is not a
problem.
written.- Refer to
"Addressing the Data" for a list of
possible indices. Only use the
same positive variable indices for
acyclic writing as for
reading. -
Entry Data type
This
Variable
index
Lowbyte Byte
Byte 7
Variable
index
Highbyte Byte
1 to 4
Data bytes 4 bytesData block for REAL, DINT, TIME, INT and
Status Byte
Error Byte
Example
The value 65.0 is to be written acyclically to the manually
adjustable output value of the second control loop. The necessary
variable .L2_YHAND has the variable index 0x015B. With
byte-wise definition, 0x5B, 0x01 (low byte before high byte) must
be used. -
The REAL number 65.0 in byte format is: 0x00, 0x00, 0x82, 0x42.
This is valid if 0xFF has been entered in the DP parameter
definition as the 4th. byte. -
The byte value to be specified as the polling number must be
different from the byte value used before.
Assumption:
So far the byte value of the polling number was 8.
In this case, the following values have to be entered in the request
bytes:
section
cyclic
Description
The low byte of the 16-bit integer value for
the variable index. --- In the
attached variable index list these
are the 2 right digits of the
hexadecimal number. ---- Only
necessary when
system does not allow to define a
16-bit integer. --
The high byte of the 16-bit integer value
for the variable index. -- In the
attached variable index list these
are the 2 digits to the right of
0x....... in hexadecimal format.
Only necessary when the master
system does not allow to define
16-bit integers. ------
BOOLean data
0x01 is delivered as the status when the
job has been carried out without
errors. - The error field contains
the value 0x00. Otherwise, 0x00 is
delivered as the status. In this
case, the error cause can be
derived from the error field.
Outputs information about the occurred
error, when the status field has the
value 0x00. Error codes:
0x00 No error.
0x40Unknown service entered in
the service field. --
0x20Unknown index entered in the
variable index field. -
the master