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Overpressure
switch
Digital
Use
input
+ 24 V means
1
Peripheral boards faulty
2
Housing purging o.k.
3
Housing temperature o.k.
4
Gas supply o.k.
5
External unit A not ready
6
External unit B not ready
7
Reserved
8
Reserved
Ground 1 to 8
9
Not used
10
Not used
11
Not used
12
Not used
13
Not used
14
Not used
15
Not used
16
Not used
Ground 9 to 16
Connection of digital inputs
Switch
3INSTALL.CHP, Stand Dezember 22, 1999
Terminal on
terminal board
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
Terminal board
+24 V
4
5
GND
66
DI 9
74
GND
Connection
of status messages to control room
Several status messages of the chromatograph are con-
nected as digital signals to the terminal board. More
details can be found in the register External wiring di-
agrams.
Analyzer failure
The signal Analyzer failure of the chromatograph is
connected to the terminal board as digital output 1.
24 V signal at terminal 30, ground e.g. at terminal 38.
In addition there is a relay contact connected to the
terminals 8 and 9. Contact opened means: Analyzer
failure.
Maintenance request
The second digital output has the meaning Maintenance
request. You can connect this signal to a lamp or horn in
the control room (see Operation using keyboard and
screen: Status). 24 V signal at terminal 31, ground e.g.
at terminal 38.
Purging pressure, zone 2
An excess pressure switch is fitted in chromatographs
for zone 2. It is closed if the purging pressure is o.k. It
is possible to monitor the purging pressure, e.g. from
the control unit, if 24 V are routed to digital output 2
via this switch.
Connection of external
status signals and digital inputs
The chromatograph monitors the following status sig-
nals:
Carrier gas pressure or supply gases
Start delay by external device A
Start delay by external device B
Further monitoring functions can be carried out using
programs.
BASIC
The status signals must be present as floating contacts.
They are wired directly to the terminal board.
16 digital inputs are present on the terminal board. The
first 8 are for internal purposes. This is shown in the
following table.
- modules are required for further digital in-
SIMATIC
puts. To connect these modules, refer in this register to
modules: Digital inputs or in the register Ex-
SIMATIC
ternal wiring diagrams.
Installation of chromatograph
7
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