Omron NX-EC0112, User Manual

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7 SSI Input Units
7 - 32 NX-series Position Interface Units User’s Manual (W524)
Additional Information
• The error status in the SSI Status parameter and the SSI Communications Error Code
parameter are both set to 0 when the data is received without an error.
• When you use the SSI Input Unit in combination with an NJ/NX-series Controller, notification
of SSI communications errors is provided in the SSI Communications Error Code in the SSI
Status of the SSI Input Unit. Also, the Controller detects an error event and manages it. Error
events for which notification is provided in the Controller are not automatically reset even
when the SSI Input Unit normally receives data. Reset the error event with an error reset
method of the Controller.
The bit configuration of the SSI Communications Error Code parameter is given in the following table.
n: Channel number
Additional Information
• The error status in the SSI Status parameter and the SSI Communications Error Code
parameter are both set to 0 when the data is received without an error.
• When you use the SSI Input Unit in combination with an NJ/NX-series Controller, notification
of SSI communications errors is provided in the SSI Communications Error Code in the SSI
Status of the SSI Input Unit. Also, the Controller detects an error event and manages it. Error
events for which notification is provided in the Controller are not automatically reset even
when the SSI Input Unit normally receives data. Reset the error event with an error reset
method of the Controller.
SSI Communications Error Code
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 --- --- --- --- ERROR CODEn
Abbr. Data Description
ERROR
CODEn SSI Communications Error Code This contains the detailed error code for ERRn.
0: No error
1: Communications Preparation Incomplete
2: Frame Error
3: Parity Error
4: Communications Timeout
5: Out of range for position difference
Error description Detection details Assumed cause Possible correction
Communications
Preparation
Incomplete This error occurs when
an SSI data input is not
at high level before the
SSI clock signal is sent. • I/O power is not being supplied.
• The SSI data input (D+ and D-) is
connected with reversed polarity.
• There is an encoder or Unit mal-
function.
• Check the I/O power supply.
• Check the SSI data input wiring.
• Replace the encoder or Unit.