Teledyne T100, Instruction Manual, Page: 155 / 404

Teledyne ML - T100 UV Fluorescence SO2 Analyzer Remote Operation & Advanced Features
155
ATTENTION
COULD DAMAGE INSTRUMENT
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 (refer to Figure 3-4). The function of each pin is defined in Table 5-8.
Con
n
ec
t t
o
I
n
ter
n
al
Grou
n
d
of
M
o
n
it
o
ring
Dev
ic
e
STATUS
1 2 3 4 5 6 7 8 D
+
S
Y
S
T
E
M
OK
HIGH RANGE
CO
NC V
ALI
D
Z
E
RO
CAL
S
P
A
N CAL
DIAGNO
S
T
IC
M
O
DE
Figure 5-23: Status Output Connector
Table 5-8: Status Output Pin Assignments
CONNECTOR PIN STATUS CONDITION (ON=CONDUCTING)
1
System Ok ON if no faults are present.
2 Conc Valid ON if concentration measurement is valid, OFF when invalid.
3 High Range ON if unit is in high range of any AUTO range mode.
4
Zero Cal ON whenever the instrument is in ZERO calibration mode.
5 Span Cal ON whenever the instrument is in SPAN calibration mode.
6
Diag Mode ON whenever the instrument is in DIAGNOSTIC mode.
7-8 Unused
D Emitter Bus
The emitters of the transistors on pins 1-8 are bussed together. For most
applications, this pin should be connected to the circuit ground of the
receiving device.
+ Dc Power + 5 VDC source, 30 mA maximum (combined rating with Control Inputs)
Digital Ground
The ground from the analyzer’s internal, 5/±15 VDC power supply.