42 Making Electrical Connections to the 600 Controller
Table 3-1 describes the screw terminals on the 600 controller.
Table 3-1 600 Controller Screw Terminals
Screw Terminal Function
S1, S2, S3, S4
(Open Collector
Outputs)
Generates an output signal to control external devices requiring a
contact closure, TTL-level signal
a
, or open collector signal. This
output signal is also capable of driving solenoid valves and other
power devices requiring up to 1 A.
You program the 600 controller to turn switches S1 through S4 ON
and OFF, or to generate a 0.6-second pulse. The time-generated
events occur as defined in the controller Program Event screen (see
the Waters 600E Multisolvent Delivery System User’s Guide).
S4 also serves as a dedicated output to an external device to indi-
cate a stop flow condition. S4 defaults to the Off position when a
stop flow condition or critical fault occurs. Use S4 to connect a
device (such as an autosampler) that must be shut off when an
error occurs, such as a high pressure shutdown or critical fault.
Inject
(Digital Input)
Receives a signal from an external injector (autosampler or Rheo-
dyne 7725i manual injector) to initiate the chromatographic run.
The Inject terminal also provides a signal to start a Waters 746
Data Module.
The Inject terminal accepts signals from several outputs, including
TTL signals, open collector outputs, or contact closures.
Stop Flow
(Digital Input)
Receives a contact closure signal to instruct the pump to stop flow.
The Stop Flow terminal accepts signals from several outputs,
including TTL signals, open collector outputs, or contact closures.
Note: The receipt of the Stop Flow signal at the 600 controller’s
Stop Flow rear panel terminal suspends the controller’s run,
gradient, and event clocks. The three clocks resume operation
when the Stop Flow signal terminates.
Hold
(Digital Output)
Generates a signal that prevents a non-IEEE-488 autosampler from
further injections in case of a power failure, pressure shutdown, or
abort condition.
The Hold terminal is compatible with TTL inputs, or inputs
expecting contact closures. If the input being controlled is polar-
ized, the grounds should be connected together and the input
terminal should be connected to the Hold terminal.
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