Teledyne 9110T instruction manual Connecting the Status Outputs

Model 9110TH NOx Analyzer Getting Started

The analyzer is now ready to have a voltage-sensing, recording device attached to that output. Calibrate the analog output as described in Section 5.9.3.2.

3.3.1.5. Connecting the 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 (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	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.

The status outputs are accessed via a 12-pin connector on the analyzer’s rear panel labeled STATUS (Figure 3-4). Pin-outs for this connector are:

STATUS

1	2	3	4	5	6	7 8 D	+
SYSTEMOK	CONCVALID	RANGEHIGH	ZEROCAL	SPANCAL	DIAGMODE	O
						CAL
						2

+5V to external device

Figure 3-10: Status Output Connector

Table 3-6: Status Output Pin Assignments

OUTPUT # STATUS DEFINITION

1SYSTEM OK

2CONC VALID

3HIGH RANGE

4ZERO CAL

5SPAN CAL

CONDITION

On if no faults are present.

On if O3 concentration measurement is valid.

If the O3 concentration measurement is invalid, this bit is OFF. On if unit is in high range of DUAL or AUTO Range Modes. On whenever the instrument is in CALZ mode.

On whenever the instrument is in CALS mode.

Teledyne Analytical Instruments 45