Allen-Bradley POINT I/O PROFIBUS 1734-APB, Руководство пользователя, Страница: 41 / 88

Publication 1734-UM005B-EN-P - June 2001
Communication and I/O Table Mapping 4-3
This section describes how the adapter handles the following services:
•
Set_Parameter
•
Check_Configuration
•
Get_Configuration
•
Data_Exchange
•
Global_Command
•
Slave_Diagnostic
Set_Parameter
The master uses this service to identify itself with the adapter and to
specify how the adapter is to operate. Set_parameter data is
comprised of a series of octets (maximum of 244). Octet 0-6 is defined
in the DIN 19245-3 standard, while octet 7-243 contain specific
information for the adapter itself (referred to as User Parameter Data).
The module configuration you previously selected is passed on to the
adapter and I/O modules via the User Parameter data.
User Parameter Data
Octet 7 in the parameter data is reserved for the Profibus-DP ASIC
onboard and must equal 00h.
Beginning at octet 8, each configured module allocates a minimum of
three bytes of user parameter data as shown in the following table.
The first two bytes define the product code for the installed module,
the third byte defines the control byte followed by configuration data
(if used).
Octet Value Description
0 - Station Status (see DIN 19245-3)
1 1-255 Watchdog Factor 1
2 1-255 Watchdog Factor 2
3 0-255 Minimum Station Delay (TSDR)
4 4 Vendor (High byte)
5 239 Vendor (Low byte)
6 - Group Identification (see DIN 19245-3)
7-243 See below User Parameter Data
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