Fieldbus
Communication
•
145
MODBUS
Functions
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Register address 0x2022 (MODBUS Address 408227, with a word count of upto 8)
Value Description,
INFO_DATE
Access Read
Description
Date of the firmware version, 8 words
Register address 0x2023 (MODBUS Address 408228, with a word count of upto 32)
Value Description,
INFO_LOADER_INFO
Access read
Description
Information to the programming of the firmware, 32 words
4.2.5.5 Constant
Registers
The following registers contain constants, which can be used to test
communication with the master:
Register address 0x2000 (MODBUS Address 408193)
Value Zero,
GP_ZERO
Access Read
Description
Constant with zeros
Register address 0x2001 (MODBUS Address 408194)
Value Ones,
GP_ONES
Access Read
Description
Constant with ones. Is –1 if this is declared as "signed int" or MAXVALUE
if it is declared as "unsigned int".
Register address 0x2002 (MODBUS Address 408195)
Value 1,2,3,4,
GP_1234
Access Read
Description
This constant value is used to test the Intel/Motorola format specifier. If the
master reads a value of 0x1234, then with Intel format is selected – this is the
correct format. If 0x3412 apears, Motorola format is selected.
Register address 0x2003 (MODBUS Address 408196)
Value
Mask 1, GP_AAAA
Access Read
Description
This constant is used to verify that all bits are accessible to the fieldbus
master. This will be used together with register 0x2004.
Register address 0x2004 (MODBUS Address 408197)
Value
Mask 1, GP_5555
Access Read
Description
This constant is used to verify that all bits are accessible to the fieldbus
master. This will be used together with register 0x2003.
Содержание 750-341
Страница 245: ...Notes 239 WAGO I O SYSTEM 750 ETHERNET TCP IP...