ABB RET670 Commissioning Manual page 67

Relion 670 series, transformer protection
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1MRK 504 165-UEN A
Transformer protection RET670 2.2 IEC
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
61

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