102 Appendix
WAGO-I/O-SYSTEM 750
750-658 CAN Gateway
Manual
Version 1.2.1, valid from FW/HW-Version 01/01
12.4 Register Communication
Register communication (control byte, bit 7 = 1) can be used to access an
internal data structure of the I/O module consisting of 64 registers each with 2
bytes (data type WORD). No automated handshake mechanism is used. That
means that register communication is shown via bit 7 of the control byte (bit 7 =
1) and must be hidden again after receipt of the response (bit 7 = 0) to continue
exchanging process data.
Change password register before write access to the register!
Write to the password register before write access to the register with the value
"0x1235".
Reset password register after write access to the register!
After writing to the registers, password register 31 must be reset to "0x0000".
Otherwise, further write access to these registers is possible until the supply
voltage is disconnected.
Check set values!
After writing to the register, check the set values by reading out the register.
Process data during register communication invalid!
During register communication, the remaining data on the I/O module is invalid
for both data directions.
