Figure 3-10: Status Output Connector; Table 3-6: Status Output Pin Assignments - Teledyne T200 Operation Manual

Teledyne API – T200 NO/NO
3.3.1.5. CONNECTING THE STATUS OUTPUTS
ATTENTION

Table 3-6: Status Output Pin Assignments

OUTPUT # STATUS DEFINITION
1
SYSTEM OK
2
CONC VALID
3
HIGH RANGE
4
ZERO CAL
5
SPAN CAL
6
DIAG MODE
7-8
D Emitter BUS
+ DC Power
Digital Ground
06858E DCN7057
/NO Analyzer Operation Manual
2 X
The status outputs report analyzer conditions via optically isolated NPN transistors that
sink up to 50 mA of DC current. These outputs can be used to 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 (see Figure 3-10).
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 through a 12-pin connector on the analyzer‟s rear panel labeled
STATUS (Figure 3-4). Pin-outs for this connector are:
Figure 3-10:
On if no faults are present.
On if O
3
If the O
3
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.
On whenever the instrument is in DIAGNOSTIC mode.
The emitters of the transistors on pins 1 to 8 are bussed together.
+ 5 VDC, 300 mA source maximum
The ground level from the analyzer's internal DC power supplies. This
connection should be used as the ground return when +5VDC power is used.
STATUS
1 2 3 4 5 6 7 8
Status Output Connector
CONDITION
concentration measurement is valid.
concentration measurement is invalid, this bit is OFF.
SPARE
SPARE
Getting Started
+
D
+5V to external device
37