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Appendices
NX-series Position Interface Units User’s Manual (W524)
A-1 Datasheets
A
A-1-3 SSI Input Units
The following table describes how to interpret the datasheets for SSI Input Units.
• I/O terminals in the terminal connection diagrams are shown as viewed from the front of the Unit.
A-1-3 SSI Input Units
Interpreting Datasheets
Unit name The name of the Unit. Model The model of the Unit.
Number of channels
The SSI communications input
capacity of the Unit.
Type of external
connections
The type of wiring for the Unit, i.e.,
terminal block or connector. For a
screwless clamping terminal block,
the number of terminals on the termi-
nal block is also given.
I/O refreshing method
The I/O refreshing method of the Unit. The following refreshing methods are supported:
Free-Run refreshing, synchronous I/O refreshing, and task period prioritized refreshing.
Indicators
The indicators on the Units and their
layout.
I/O signals
The I/O signals.
I/O interface The specifications of the applicable serial interface.
Clock output The specifications of the CLK line.
Data input The specifications of the data line.
Maximum data length The valid data length.
Coding method The format of the SSI data that can be received.
Baud Rate The baud rate that you can use for SSI communications.
Dimensions
The external dimensions of the Unit.
Dimensions are given in the follow-
ing form: W × H × D. The unit is mm.
Isolation method
The isolation method between the
input circuits and the internal circuits
in the Unit.
Insulation resistance
The insulation resistance between
the input circuits and the internal cir-
cuits in the Unit.
Dielectric
strength
The dielectric strength between the
input circuits and the internal circuits
in the Unit.
I/O power supply
method
The method that is used to supply
I/O power to the Unit. The supply
method is determined for each Unit.
Power is supplied either from the NX
bus or from an external source.
Current capacity
of I/O power sup-
ply terminals
The current capacity of the I/O power
supply terminals (IOV/IOG) on the
Unit. You cannot exceed this value
when you supply I/O power to exter-
nal devices that are connected to the
Unit.
NX Unit power con-
sumption
The power consumption of the Unit
from the NX Unit power supply.
Current con-
sumption from
I/O power supply
The current consumption of the Unit
from the I/O power supply. The
above input current and the current
consumption of connected external
devices are not included.
Maximum transmission
distance
The maximum SSI communications transmission distance for the Unit.
Weight The weight of the Unit.
Circuit layout The circuit layout of the input circuits to the Unit.
Installation orientation
and restrictions
The installation orientation of a Slave Terminal that includes this Unit. Any restrictions to specifi-
cations that result from the installation orientation are also given.
Terminal connection
diagram
The connection diagram between the Unit and external devices. Any I/O Power Supply Connec-
tion Units or Shield Connection Units that are required to connect the external devices are also
shown.
Failure detection
The failure detection functions of the
Unit.
Protection
The protection functions of the Unit.
Terminal Connection Diagrams
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