Geo Brick Drive User Manual
Pinouts and Software Setup
59
Encoder Loss Detection, Quadrature
Designed for use with differential line-driver outputs (encoders), the encoder loss circuitry monitors each
quadrature input pair with an exclusive-or XOR gate. In normal operation mode, the two quadrature
inputs should be in opposite logical states – that is one high and one low – yielding a true output from the
XOR gate.
Note
Single-Ended Quadrature Encoders are not supported for encoder loss.
Ch# Address/Definition Ch# Address/Definition
1
Y:$78807,0,1
5
Y:$78807,4,1
Status Bit Definition
2
Y:$78807,1,1
6
Y:$78807,5,1
=0
Encoder lost, Fault
3
Y:$78807,2,1
7
Y:$78807,6,1
=1
Encoder present, no Fault
4
Y:$78807,3,1
8
Y:$78807,7,1
Caution
Appropriate action (user-written plc) needs to be implemented when
an encoder loss is encountered. To avoid a runaway, an immediate
Kill of the motor/encoder in question is strongly advised.
No automatic firmware (Geo Brick) action is taken upon detection of encoder(s) loss; it is the user’s
responsibility to perform the necessary action to make the application safe under these conditions, see
example PLC below. Killing the motor/encoder in question is the safest action possible, and strongly
recommended to avoid a runaway, and machine damage. Also, the user should decide the action to be
taken (if any) for the other motors in the system. The Encoder Loss Status bit is a low true logic. It is set
to 1 under normal conditions, and set to 0 when a fault (encoder loss) is encountered.
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