WAGO 750-872/020-000 Manual page 180

172 • MODBUS Functions
Internal Variables
Register address 0x1028 (MODBUS Address 404137)
Designation
Access
Description
Register address 0x1029 (MODBUS Address 404138, with a word count of upto 9)
Designation
Access
Description
Register address 0x102A (MODBUS Address 404139, with a word count of 1)
Designation
Access
Description
Register address 0x1030 (MODBUS Address 404145, with a word count of 1)
Designation
Access
Default
Description
Register address 0x1031 (MODBUS Address 404146, with a word count of 3)
Designation
Access
Description
Boot options
read / write
Boot configuration:
1: BootP
2: DHCP
4: EEPROM
MODBUS TCP statistics
read / write
1 word SlaveDeviceFailure
1 word BadProtocol;
1 word BadLength;
2 words BadFunction;M
2 words Bad Address;
2 words BadData;
2 words TooManyRegisters; -> Number of the registers which can be
2 words TooManyBits
2 words ModTcpMessageCounter-> Number of received MODBUS/TCP
With Writing 0xAA55 or 0x55AA in the register will reset this data area.
Modbus TCP Connections
read
Number of TCP connections
Configuration MODBUS/TCP Timeout
read / write
0x0000
This is the maximum number of milliseconds the buscoupler will allow a
ModbusTCP connection to stay open without receiving a Modbus request.
Upon timeout, idle connection will be closed. Outputs remain in last state.
Default value is 0 (timeout disabled).
Read the MAC-ID of the controller
read
This register gives the MAC-ID, with a length of 3 words
-> internal bus error, F-bus error by
activated watchdog
-> error in the MODBUS TCP header
-> Wrong telegram length
-> Invalid function code
-> Invalid register address
-> Invalid value
worked on is too large, Read/Write
125/100
-> Number of the coils which can
be worked on is too large, Read/Write
2000/800
requests
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP