Teledyne gfc 7000ta Connecting the Status Outputs, 3 4 5 6 7 8 D, Status Output Pin-outs

Getting Started Model GFC7000TA Carbon Dioxide Analyzer

3.5.4. Connecting the Status Outputs

If you wish utilize the analyzer’s status outputs to interface with a device that accepts logic-level digital inputs, such as programmable logic controllers (PLC’s) they are accessed via a 12-pin connector on the analyzer’s rear panel labeled STATUS.

STATUS

1 2 3 4 5 6 7 8 D +

NOTE

Most PLC’s have internal provisions for limiting the current the input will draw. When connecting to a unit that does not have this feature, external resistors must be used to limit the current through the individual transistor outputs to ≤50mA (120 Ω for 5V supply).

The pin assignments for the status outputs can be found in the table below:

		Table 3-5: Status Output Pin-outs
OUTPUT #	STATUS	CONDITION
	DEFINITION
1	SYSTEM OK	On if no faults are present.
2	CONC VALID	On if CO2 concentration measurement is valid.
		If the CO2 concentration measurement is invalid, this bit is OFF.

3HIGH RANGE On if unit is in high range of DUAL or AUTO range modes.

4ZERO CAL On whenever the instruments ZERO point is being calibrated.

5SPAN CAL On whenever the instruments SPAN point is being calibrated.

6DIAG MODE On whenever the instrument is in DIAGNOSTIC mode.

7	ALARM1	On whenever the measured CO2 concentration is above the set point for
		ALM1
8	ALARM2	On whenever the measured CO2 concentration is above the set point for
		ALM2
D	EMITTER BUS	The emitters of the transistors on pins 1-8 are bused together.
+	DC POWER	+ 5 VDC
	Digital Ground	The ground level from the analyzer’s internal DC power supplies.

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