Teledyne API - Model T200H/T200M Operation Manual
Getting Started
35
3.4.4. CONNECTING THE STATUS OUTPUTS
The analyzer’s status outputs to interface with a device that accepts logic-level digital
inputs, such as programmable logic controller (PLC) chips, are accessed through a 12
pin connector labeled STATUS on the analyzer’s rear panel.
EM
IT
T
ER
B
U
S
F
O
R
PI
N
S 1
-8
STATUS
1 2 3 4 5 6 7 8 D
+
SY
ST
E
M
O
K
HI
G
H RANG
E
CO
NC V
AL
ID
Z
E
RO
CAL
S
P
A
N CAL
DI
AG
NO
S
T
IC
MO
D
E
L
O
W S
PA
N
Figure 3-8:
Status Output Connector
Note
Most PLCs have internal provisions for limiting the amount of 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).
Table 3-6: Status Output Signals
PIN #
STATUS
CONDITION (ON = CONDUCTING)
1
SYSTEM OK
ON if no faults are present.
2
CONC VALID
ON if concentration measurement (NO, NO
2
or NOx) is valid.
OFF any time the hold-off feature is active.
3
HIGH RANGE
ON if unit is in high range of the Auto Range Mode.
4
ZERO CAL
ON whenever the instrument is in ZERO point calibration mode.
5
SPAN CAL
ON whenever the instrument is in SPAN point calibration mode.
6
DIAG MODE
ON whenever the instrument is in diagnostic mode.
7
LOW SPAN CAL
ON when in low span calibration (optional equipment necessary)
8
Not Used
D
EMITTER BUS
The emitters of the transistors on pins 1-8 are tied together.
Not Used
+
DC POWER
+ 5 VDC, 300 mA (combined rating with Control Output, if used).
Digital Ground
The ground level from the analyzer’s internal DC power supplies
07270D DCN7141