WAGO 750-830 Manual page 243

Register address 0x2021 (MODBUS Address 408226, with a word count of up to 8)
Value
Access
Description
Register address 0x2022 (MODBUS Address 408227, with a word count of up to 8)
Value
Access
Description
Register address 0x2023 (MODBUS Address 408228, with a word count of up to 32)
Value
Access
Description
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
Access
Description
Register address 0x2001 (MODBUS Address 408194)
Value
Access
Description
Register address 0x2002 (MODBUS Address 408195)
Value
Access
Description
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
Description, INFO_DESCRIPTION
Read
Time of the firmware version, 8 words
Description, INFO_DATE
Read
Date of the firmware version, 8 words
Description, INFO_LOADER_INFO
read
Information to the programming of the firmware, 32 words
Zero, GP_ZERO
Read
Constant with zeros
Ones, GP_ONES
Read
Constant with ones. Is –1 if this is declared as "signed int" or MAXVALUE
if it is declared as "unsigned int".
1,2,3,4, GP_1234
Read
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.
Fieldbus Communication
MODBUS Functions
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