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7 SSI Input Units
NX-series Position Interface Units User’s Manual (W524)
7-7 I/O Data Specifications
7
7-7-2 Data Details
The data items that you can allocate to I/O for a Two-input Unit are listed in the following table.
This section describes the data configuration for each of the 7 data items for I/O allocation.
The bit configuration of the SSI Status parameter is given in the following table.
n: Channel number
NX-ECS212
Area Data item
Size
(bytes)
Data type
Default
*1
*1. The Default column shows the data item that are set when the Unit is shipped from the factory. You can allocate
other data items.
MC Function
Module PDO
*2
*2. These PDOs are required to use the MC Function Module.
Input SSI Status 1 1 BYTE Yes
SSI Communications Error Code 1 1 BYTE Yes
Encoder Present Position 1 4 DINT Yes Yes
Status Data 1 4 DWORD Yes
Encoder Present Position Refresh
Count 1
2UINT
Time Stamp 1
*3
*3. An EtherCAT Coupler Unit with unit version 1.1 or later is required.
8ULINT
SSI Status 2 1 BYTE Yes
SSI Communications Error Code 2 1 BYTE Yes
Encoder Present Position 2 4 DINT Yes Yes
Status Data 2 4 DWORD Yes
Encoder Present Position Refresh
Count 2
2UINT
Time Stamp 2
*3
8ULINT
Output SSI Operation Command 1 2 WORD
SSI Operation Command 2 2 WORD
7-7-2 Data Details
SSI Status
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 --- --- --- --- --- CRUNn ERRn REFn
Abbr. Data Description
REFn Data Refresh Status This indicates when the position data changes from its previous
value.
This bit toggles between 0 and 1 every time the data changes.
ERRn SSI Communications Error Sta-
tus
1: Error occurred.
0: No errors occurred.
CRUNn
SSI Communications Enabled
*1
*1. The status of this bit depends on the value of the SSI Communications Enable bit in the SSI Operation Com-
mand parameter. Refer to SSI Operation Command on page 7-35 for information on the SSI Operation Com-
mand parameter.
1: SSI communications enabled.
0: SSI communications disabled.
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