User Guide

Remote Operation and Advanced Features Teledyne API M100E Analyzer Operation Manual
158
7.3. REMOTE OPERATION
7.3.1. REMOTE OPERATION USING THE EXTERNAL DIGITAL I/O
7.3.1.1. STATUS OUTPUTS
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 (PLC’s). 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.
NOTE
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.
The status outputs are accessed through a 12 pin connector on the analyzer’s rear panel labeled STATUS (refer
to Figure 7-31). The function of each pin is defined in Table 7-8.
Connect to Internal
Ground of Monitoring
STATUS
1 2 3 4 5 6 7 8 D
+
SYSTEM O
K
HIGH RANGE
CONC VALID
ZERO CAL SPAN CAL
DIAGNOSTIC MODE
Figure 7-31: Status Output Connector
04515F DCN6048