ABB RET670 - Page 65

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.
1MRK 504 165-UUS - Section 5
Configuring the IED and changing settings
Transformer protection RET670 2.2 ANSI 59
Commissioning manual