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1 Features and System Configuration

NX-series Position Interface Units User’s Manual (W524)

1-4 Functions

1-4-2 Functions of SSI Input Units

The following table lists the functions of the SSI Input Units.

Refer to 7-9 Functions on page 7-38 for details on these functions.

1-4-2 Functions of SSI Input Units

Function Description

SSI data settings Allows you to set the bit position and data length for each counter based on the

format of the SSI data.

Coding method Allows you to select whether to convert the received SSI data for each counter.

Encoder count direction Allows you to set the counting direction for the SSI Input Unit to 0 (Not to invert

the sign) or 1 (Invert the sign).

Bit shifting If the number of error bits or location of the position data from the SSI encoder is

incorrect, you can shift the first bit of the received frame to correct the problem.

Parity check Performs a parity check on the SSI data.

Data refresh status Allows you to check for updates to the SSI data.

Error data detection Allows you to prevent refreshing and designate SSI data as error data when the

code conversion result causes a change in position that exceeds the set value.

I/O refreshing method setting

Sets Free-Run refreshing, synchronous I/O refreshing,

or task period prioritized

refreshing

*1, *2

for the I/O refreshing

method.

All counters use the same setting.

*1. You can select this option only when the Unit is used with a EtherCAT Coupler Unit with EtherCAT communi-

cations in DC Mode.

*2. Unit version 1.2 or later and an NX-ECC203 EtherCAT Coupler Unit are required.

*3. This is the data exchange with the Controller.

Time stamping

*4. An EtherCAT Coupler Unit with unit version 1.1 or later is required.

The time when the counter value changed is retained. You can use this function

only when the I/O refreshing method is set to synchronous I/O refreshing.

Omron NX-EC0112 User Manual

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