INFICON Composer Gas Concentration Controller - Manual (Page 119)

4 - 23
IP
N 07
4-
28
9L
Composer Operating Manual
The eight inputs are active when the specific input’s terminal is pulled to ground
(common) (<0.8 V) through a contact closure or with TTL/CMOS logic having
current sink capability of 2 ma. (1 low power TTL load). The input ports are
protected to +/- 30 V with respect to chassis ground. See
Table 4-2 .
NOTE: These ports are updated every 200 milliseconds; signals must be
present during a read cycle. All inputs are leading edge detected and
executed.
.
Table 4-2 System I/O Connector Function
Relay
I/O #
FUNCTION PIN #s Comment
K1 @ TEMPERATURE 1,2 Closed when the Resonant
Chamber is within +0.1
°C to
-0.2 °C of set point
K2 ERROR 3,4 Opens when the instrument
is in an error. See
Table 6-7
on page 6-7 .
K3 @ CONCENTRATION 5,6 Closed when concentration
is within programmed target
band
K4 STEADY 7,8 Concentration Control
configuration: closed when
front panel STEADY light is
illuminated.
Bulk Flow Control mode:
used to pass control voltage
from Control Out of
Composer to bubbler’s MFC
when in external control.
K5 user set Reference Zero 9,10 NO
10,11 NC Concentration Control
configuration: closed when
factory Reference Zero has
been overridden
Bulk Flow Control mode:
used to pass control voltage
from reactor to bubbler’s
MFC when in external
control. Use pins 10,11 to
insure continuity if instrument
is powered off.