Filter
Top Products
Operating Instructions Teledyne API Model T360/T360M Operation Manual
152
4.15. REMOTE OPERATION OF THE ANALYZER
4.15.1. Remote Operation Using the External Digital I/O
4.15.1.1. 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 (Figure 4-13).
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 via a 12-pin connector on the analyzer’s rear
panel labeled STATUS. The function of each pin is defined in Table 4-23.
Connect to
Internal Ground of
Monitoring Device
STATUS
1 2 3 4 5 6 7 8 D +
SYSTEM OK
HIGH RANGE
CONC VALID
ZERO CAL
SPAN CAL
DIAGNOSTIC MODE
ALARM 1
ALARM 2
Figure 4-13: Status Output Connector
07272B DCN6552