Rockwell Automation 1897-NOV High Speed Analog Installation Instructions - Manual (Page 7)

Fast Isolated Analog Output Module 7
Publication CIG-5.1 – April 1998
When using shielded cable, ground the foil shield and drain wire
only at one end of the cable. We recommend that you wrap the foil
shield and drain wire together and connect them to the “S”
connection on the RTP for the particular channel. All shield
connections are internally connected together in the RTP so that only
one wire is required to ground the entire remote termination panel.
Connect a wire from the “SH” connection on the RTP to a ground
stud on the metal cabinet in which the remote termination panel is
mounted.
If you do not want to ground a particular shield at the RTP, you can
remove the jumper for that particular channel. This will allow the
shield to float at the RTP end. To remove a jumper, you must cut it
out. Once the jumper is removed it cannot be replaced. Clip as
close to the circuit board as possible at both ends to completely
remove it. The jumpers are labeled J1 through J8, corresponding to
channels 1 through 8 respectively.
J1
J2
J3
J4 J8
J7
J6
J5
Jumpers for
channels
1 through 4
Jumpers for
channels
5 through 8
Refer to publication 1770-4.1, Programmable Controller Wiring and
Grounding Guidelines, for additional information.
The 1897–NOV module uses digital data transfers for backplane data
transfer. Configure your module as a double density module (1 slot
addressing). Address all channels individually.
The module uses channel 8 as a trigger to synchronize data transfer
to the module’s digital-to-analog converters (DACs). All DACs are
updated following a write of data to channel 8. This update occurs
regardless of whether data changed on any other channel.
When any channel other than channel 8 is written to, the data is
parsed and stored internally, but the DAC is not updated until a
channel 8 write is completed. The status of which channel(s) change
(and, as a result, modify the analog outputs on the module on the
next trigger event) is reflected in the digital input image table. The
least significant byte of the digital input word will indicate the
updated channel(s). If the input bit is 1 (high), on the next trigger
event, the analog output value associated with that channel changes.
Grounding Your Field
Devices
Communicating with Your
Output Module