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Electronic Considerations For The Optional Rear Panel Interface; Discrete I/O J120 Inputs - Agilent Technologies 947 Betriebs- Und Servicehandbuch

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Models 947, 948 and 960 Leak Detectors Operations and Service Manual
2.3 Electronic Considerations for the
Optional Rear Panel Interface
This section includes information necessary to interface the 947/948/960 with a PLC or a
host computer using either serial or parallel communications through the optional rear
panel interface via J120 Discrete I/O, J121 BCD Outputs and J123 Host Serial Port.

2.3.1 Discrete I/O J120 Inputs

The discrete I/O is used to control operations via a PLC. Table 2-2 provides the input
connections.
Pin on
J120
1
Ground return for J120 only
2
Reject Output
3
Stop
4
Start
6
Parallel Enable
7
Zero
9
Auto Cal
10
Decrement
11
Increment
12
Auto Range
14
Hold
15
Filament Fault
16
Not Ready
18
CAL OK
19
Zeroing
Table 2-2 J120 Input Connections
Input Name
Active High
200 msec high pulse
200 msec high pulse
Active High
200 msec high pulse
200 msec high pulse
200 msec high pulse
200 msec high pulse
Active High
Active High
Active High
Active High
Active High
Momentary or Level
Description
Leak rate signal is higher than
reject set point.
Unit goes to vent mode.
Goes to fine test via rough gross
modes.
Enables rear panel PLC Interface.
Begins Auto Zero routine.
Begins Auto Calibrate.
Decrements the exponent when in
manual ranging.
Increments the exponent when in
manual ranging.
Automatically changes the
exponent to keep the reading in
range.
Places the system in Hold mode.
Active when selected ion source
filament is non-functional.
Not ready to run – possible fault.
Active when last CALIBRATE
successful.
Active when Auto Zeroing.
2-9

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948960

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