Technical data

166 • MODBUS Functions
Internal Variables
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
6.5.3 Configuration Functions
The following registers contain configuration information of the connected
modules:
Register address 0x1022 (MODBUS Address 404131)
Designation CnfLen.AnalogOut
Access read
Description Number of word-based outputs registers in the process image in bits (divide
by 16 to get the total number of analog words)
Register address 0x1023 (MODBUS Address 404132)
Designation CnfLen.AnalogInp
Access read
Description Number of word-based inputs registers in the process image in bits (divide by
16 to get the total number of analog words)
Register address 0x1024 (MODBUS Address 404133)
Designation CnfLen.DigitalOut
Access read
Description Number of digital output bits in the process image
Register address 0x1025 (MODBUS Address 404134)
Designation CnfLen.DigitalInp
Access read
Description Number of digital input bits in the process image
Register address 0x1028 (MODBUS Address 404137)
Designation Boot options
Access read / write
Description Boot configuration:
1: BootP
2: DHCP
4: EEPROM
Register address 0x1029 (MODBUS Address 404138, with a word count of upto 9)
Designation MODBUS TCP statistics
Access read / write
Description 1 word SlaveDeviceFailure -> internal bus error, F-bus error by
activated watchdog
1 word BadProtocol; -> error in the MODBUS TCP header
1 word BadLength; -> Wrong telegram length
2 words BadFunction;M -> Invalid function code
2 words Bad Address; -> Invalid register address
2 words BadData; -> Invalid value
2 words TooManyRegisters; -> Number of the registers which can be
worked on is too large, Read/Write
125/100
2 words TooManyBits -> Number of the coils which can
be worked on is too large, Read/Write
2000/800
2 words ModTcpMessageCounter-> Number of received MODBUS/TCP
requests
With Writing 0xAA55 or 0x55AA in the register will reset this data area.