Bcd Discrete Output Parallel Interface (J121) - Agilent Technologies 947 Betriebs- Und Servicehandbuch

Models 947, 948 and 960 Leak Detectors Operations and Service Manual
D.2.2 BCD Discrete Output Parallel Interface (J121)
The discrete I/O DB25 connector is used to control operations via a PLC. Table D-3
provides the J121 DB25 BCD connections.
Table D-3 Optional BCD Discrete Output Parallel Interface (J121)
Pin
1, 2, 24, 25 Ground for J121
20,21 +24 VDC for Output Sourcing
22 Analog Leak Rate
23 Analog Leak Rate
19 Leak Rate Update Pulse
Mantissa
3 LSD A
4 LSD B
5 LSD C
6 LSD D
7 MSD A
8 MSD B
9 MSD C
10 MSD D
Exponent
11 LSD A
12 LSD B
13 LSD C
14 LSD D
15 MSD A
16 MSD B
17 MSD C
18 MSD D
Signal Name Momentary
or Level
Analog Voltage 0 to 10 V signal that is
updated when in running
mode
Analog Voltage Return for pin 22
Output Leak rate is updated on
falling edge and is stable
as long as output is low
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Active High BCD Leak Rate.
Description
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Input/
Output
D-3