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Connecting the Analog Output Channel
The analog output channel must be set by the user who can map it to any one of several
functions, such as concentration value, temperatures, pressures, etc. The output signals
range between 0 and 5 VDC.
To access these signals attach a strip chart recorder and/or data-logger to the analog output
connector on the communications and output panel of the calibrator.
Configure and calibrate this channel through the Setup>Analog Outputs menu (Section
3.3.9), and view its output from the Utilities>Diagnostics>Analog Outputs menu.
Connecting the Status Outputs (Digital Outputs)
The status outputs report calibrator conditions via optically isolated NPN transistors, which
sink up to 50 mA of DC current. These outputs can be used to interface with devices that
accept logic-level digital inputs, such as programmable logic controllers (PLCs). Each
Status bit is an open collector output that can withstand up to 40 VDC. All of the emitters
of these transistors are tied together and available at pin D.
ATTENTION
The status outputs are accessed via a 12-pin connector on the calibrator's communications
and output panel labeled STATUS. The function of each pin is defined in Table 2-2. Select
each output as desired and map to the signals available in the Setup>Digital Outputs.
083730750B DCN8606
ANALOG OUT
+
–
Figure 2-5. Analog Output Connector
COULD DAMAGE INSTRUMENT AND VOID WARRANTY
Most PLC's have internal provisions for limiting the current that the
input will draw from an external device. When connecting to a unit that
does not have this feature, an external dropping resistor must be used
to limit the current through the transistor output to less than 50 mA.
At 50 mA, the transistor will drop approximately 1.2V from its collector
to emitter.
STATUS
1
2
3
4
5
6
7
Figure 2-6. Status Output Connector
+
8
D
25
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Troubleshooting
