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Operating Instructions
4.15. Remote Operation
4.15.1. REMOTE OPERATION USING THE EXTERNAL DIGITAL I/O
4.15.1.1. Status Outputs
Note
164
The status outputs report analyzer conditions via optically isolated NPN transistors,
which sink up to 50 mA of DC current. These outputs can be used 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 D.
Most PLCs 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.
The status outputs are accessed through a 12 pin connector on the analyzer's rear panel
labeled STATUS (see Figure 4-15). The function of each pin is defined in Table 4-29
1
2
3
4
Figure 4-15:
Teledyne API - Model T200H/T200M Operation Manual
STATUS
5
6
7
8
Status Output Connector
+
D
07270D DCN7141
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