176 • MODBUS FunctionsInternal VariablesWAGO-I/O-SYSTEM 750ETHERNET TCP/IP0x1025 R 1 Number of digital input data in the process image (in bits)0x1028 R/W 1 Boot configuration0x1029 R 9 MODBUS-TCP statistics0x102A R 1 Number of TCP connections0x1030 R/W 1 Configuration MODBUS/TCP Timeout0x1031 W 1 Read out the MAC-ID of the controller0x1050 R 3 Diagnosis of the connected I/O Modules0x2000 R 1 Constant 0x00000x2001 R 1 Constant 0xFFFF0x2002 R 1 Constant 0x12340x2003 R 1 Constant 0xAAAA0x2004 R 1 Constant 0x55550x2005 R 1 Constant 0x7FFF0x2006 R 1 Constant 0x80000x2007 R 1 Constant 0x3FFF0x2008 R 1 Constant 0x40000x2010 R 1 Firmware version0x2011 R 1 Series code0x2012 R 1 Controller code0x2013 R 1 Firmware versions major revision0x2014 R 1 Firmware versions minor revision0x2020 R 16 Short description controller0x2021 R 8 Compile time of the firmware0x2022 R 8 Compile date of the firmware0x2023 R 32 Indication of the firmware loader0x2030 R 65 Description of the connected busmodules (module 0–64)0x2031 R 64 Description of the connected busmodules (module 65-128)0x2032 R 64 Description of the connected busmodules (module 129-192)0x2033 R 63 Description of the connected busmodules (module 193-255)0x2040 W 1 Software reset (Write sequence 0x55AA or 0xAA55)0x2041 W 1 Format Flash-Disk0x2042 W 1 Extract HTML sides from the firmware0x2043 W 1 Factory Settings