Technical data

Fieldbus Communication • 243
MODBUS Functions
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
Register address 0x2021 (MODBUS Address 408226, with a word count of up to 8)
Value Description, INFO_DESCRIPTION
Access Read
Description Time of the firmware version, 8 words
Register address 0x2022 (MODBUS Address 408227, with a word count of up to 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 up to 32)
Value Description, INFO_LOADER_INFO
Access read
Description Information to the programming of the firmware, 32 words
4.3.5.5 Constant Registers
The following registers contain constants, which can be used to test communi-
cation 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 appears, Motorola format is selected.