Rockwell Automation 1395 Digital Reference Adapter for RTP Applications - Manual (Page 17)

Publication 1395-RTP-5.2 - September 1997
Hardware Description 2-5
Analog Inputs The Digital Reference Adapter Board contains two programmable 12-bit,
analog to digital inputs. These inputs allow a ±10V DC analog signal to
be converted to a ±2048 digital signal, thus providing 4.88 millivolts per
bit resolution. Both inputs have special digitally programmable analog
offset adjustments and digitally controlled variable analog gain
adjustments prior to being multiplexed into the analog to digital
converter. In the RTP application, Channel 1 is configured by default to a
special Dancer potentiometer input. The inputs are also configurable to
represent any of the Bulletin 1395 Drive signal inputs or the input of
another Adapter Board. These inputs also have digitally programmable
digital gain and digital offset which provides maximum interface
flexibility.
Connector J2 is used to complete the interconnection for the analog
inputs between the Adapter Board and the Terminal Block (TB-3),
which is used to make the external connections.
• J2-12 to TB3-31 Analog Input 1 +
• J2-11 to TB3-32 Analog Input 1 -
• J2-10 to TB3-33 Analog Input 2 +
• J2-09 to TB3-34 Analog Input 20 -
Analog Outputs The Digital Reference Card contains two programmable 12-bit,
digital to analog outputs, neither of which is used in the RTP
application. These outputs allow a ±2048 Drive signal to be converted
to a ±10V DC analog output, thus producing 9.76 millivolts per bit
resolution. Through programming of associated Scale and Offset
parameters, the effective range of the Drive signal can be extended to
±32767. The digital Drive signal can be any of the Drive run-time
parameters.
Connector J2 is used to complete the interconnection for the analog
outputs between the Adapter Board and the Terminal Block (TB-3),
which is used to make the external connections.
• J2-04 to TB3-39 Analog Output 1
• J2-03 to TB3-40 Analog Output 1 Common
• J2-02 to TB3-41 Analog Output 2
• J2-01 to TB3-42 Analog Output 2 Common