INFICON Maxtek PM-700 Plating Monitor - Manual (Page 49)

PM-700 SERIES PLATING MONITOR
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pressing the Stop button or the ongoing active process may be inadvertently
terminated.
4.7.2 Automatic probe swapping
When the Probe Swap parameter is set to Auto, certain conditions will initiation
an automatic probe swap. Conditions that will initiate an automatic probe swap
are listed below:
4.7.2.1 Auto probe swap on active probe failure.
If the Probe Swap parameter is set to Auto, and the monitor is in the Plate State,
then an automatic swap to the standby probe will be initiated if the active probe
should fail.
4.7.2.2 Alternating Probe mode.
When the monitor is in the Alternating Probe mode the probe is automatically
swapped at the end of each sample period.
4.7.2.3 Failed Standby Probe inhibits automatic swap.
The Standby probe is checked for a valid frequency signal prior to initiation of an
automatic probe swap. If the Standby probe has failed, the swap is not initiated
and the monitor automatically goes into the Auto Complete mode.
4.8 EXTERNAL INTERFACE
In addition to front panel controls, PM-700 Series Plating Monitors are equipped
with I/O connectors allowing the monitor to interface with external devices. The
I/O connectors are located on the rear panel of the monitor. The following
sections provide descriptions of each connector.
4.8.1 Discrete Inputs
Discrete input signals can be used to remotely initiate any one of the five front
panel functions. With exception of the Swap Probes Input, all other inputs act
like a front panel key is pushed. Start PrePlate Input initiates preplate process,
Start Plate initiates plating process, Start DePlate initiates deplating process, and
Stop terminates any active process or clears failure messages. Swap Probes input
will cause the monitor to swap from active probe to the standby one. This input is
not available in the PM-700.
Each discrete input is independently pulled up to 5 volts through a 4.7 k
ς
resistor.
A ground signal is required to activate an input function. The ground signal on
pin 6 of the Discrete Input connector is provided for this purpose. Discrete Input
signals are provided through a six pin Mini-Din circular connector. Pin
assignments are listed below and Figure 9 shows the connector outline.