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Operating Instructions Teledyne API - Model 200EH/EM Operation Manual
140
6.15. REMOTE OPERATION OF THE ANALYZER
6.15.1. REMOTE OPERATION USING THE EXTERNAL DIGITAL I/O
6.15.1.1. 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 (see
Figure 6-17). The function of each pin is defined in Table 6–29
COMMON
EMITTERS
STATUS
1 2 3 4 5 6 7 8 D +
SYSTEM OK
HIGH RANGE
CONC VALID
ZERO CAL
SPAN CAL
DIAG MODE
LOW SPAN
GROUND
Figure 6-6-17: Status Output Connector
04521C (DCN5731)