ABB REG670 Commissioning Manual page 63

1MRK 502 073-UEN A
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Commissioning manual
Each logical I/O module has an error flag that indicates signal or module failure.
The error flag is also set when the physical I/O module of the correct type is not
detected in the connected slot.
Configuring the IED and changing settings
Section 5
57