Allen-Bradley POINT I/O PROFIBUS 1734-APB, Руководство пользователя, Страница: 42 / 88

Publication 1734-UM005B-EN-P - June 2001
4-4 Communication and I/O Table Mapping
Product Code
The product code is used to determine the identity of the module
installed in each slot. The code is defined in the GSD file and is
automatically extracted by the configuration tool when you add the
modules to your configuration. (Refer to appendix B for module
product codes.) If an installed module does not match the product
code for that slot, the slot is considered faulty and the adapter will
respond to the Set_Parameter service with a negative
acknowledgement. This will cause the master to set the Parameter
fault bit in the Slave_Diagnostic service.
Note: Data exchange is not possible if the product code and installed
module do not match.
Control Byte
The control byte is used to determine how the module should
operate. The control byte is included in the GSD file.
Bit 7 - This bit is used to enable/disable the diagnostic function for the
module.
Octet Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
7 Reserved
8 Product Code High Byte of First Module
9 Product Code Low Byte of First Module
10 Control Byte for First Module
11 Configuration Data for First Module*
... ...
X Product Code High Byte for last Module
X + 1 Product Code Low Byte for last Module
X + 2 Control Byte for Last Module
X + 3 Configuration Data for Last Module*
* Present only if selected module has configuration data. Refer to “Adding I/O Modules to your Configuration.”
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Diagnostic
ON/OFF Module
Type Configuration data size (bytes); or number of bits allocated
to the opened byte (in bit-stuffing)
Bit Value Description
0 Disable diagnostics
1 Enable diagnostics