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System Operation
312779E 81
Typical PLC Interaction with
ProMix 2KS
This section describes a typical interaction when a local
PLC is directly connected to the Discrete I/O connec-
tions of the ProMix 2KS.
See ProMix 2KS Integration Specifics on page 51 for
a detailed explanation of inputs and outputs.
NOTE: Communications fields of Configure Screen 6
must be set to DISCRETE (see page 35).
Start Mixing
To start the mix process, the PLC will monitor and
ensure the Mix_Ready output is High. This provides
assurance it is ready to mix. PLC will drive High the
Mix_Start input, keep it High and monitor the Mix_Active
output to ensure the ProMix 2KS followed through on
the request.
Stop Mixing
To stop mixing (to perform a purge or color change),
remove the Mix_Start input (the status bar on the
EasyKey will show STANDBY). Monitor the Mix_Ready
output to ensure the Mix_Active output goes Low.
Color Change
To perform a color change, ensure there are no alarms
(except the Potlife Alarm). If alarms are present, the
Alarm_Reset input should be sent momentarily to clear
the alarm (>100 msec).
NOTE: Alarm_Reset will not reset a Potlife alarm. Only
dispensing the Potlife Volume or a complete
Purge/Color Change will reset a Potlife alarm.
The Alarm Reset Input will silence the audible alarm.
Turn the Color_Change_Start input on momentarily
(>100 msec) while the proper sequence of recipe bits
are set.
NOTE: The Recipe Bits must be presented at least 100
msec before the Color Change Start input is turned on
and remain until a new recipe is required.
During the short On state, the recipe will be read from
this binary sequence and the status bar of the EasyKey
will display COLOR CHANGE XX. The
Purge_CC_Active output will be High for the duration of
the color change purge process. During the Mixed Mate-
rial Load portion at the end of the Color Change
sequence, the Fill_Active output will be on, indicating
that portion of the color change. These will not be on at
the same time. Once the Mix_Ready output goes High
with no alarms, then the PLC has assurance that the
requested color change has taken place with the
requested recipe being the current active recipe. If any
error occurs during the process, the requested recipe
will not be loaded, and the old recipe will remain active.
NOTE: It is not possible to read the active recipe
through Discrete I/O alone. Only by monitoring net-
worked registers through the Gateway is it possible to
view the active recipe. Proper management of the alarm
status outputs during the color change process will
ensure the active recipe is what is expected.
Purge
To start a Purge (no color change), drive the
Purge_Start input High (maintained) while ensuring
Mix_Ready output is High (ensuring no active alarms).
An exception is Potlife alarm (see Color Change above
if alarms are present.) The Purge_CC_Active output is
High for the entire Purge process. Ensure there are no
alarms during this process. Fill_Active is High when Mix
is on. When complete, Mix _Ready output will be High,
indicating a completed purge.
NOTE: No change is made to the active recipe.
Gun Trigger Input
This input is sent and expected every time the gun is
actually triggered, and this input is turned off when the
gun is not triggered. Never tie this input with any other
signal. Without this input, some critical mixing alarms
are eliminated.
IMPORTANT: This input must be provided through Dis-
crete I/O for integrated flow control applications, to
ensure fast coordination with the flow control process.
Applications without flow control can use Gun Trigger
input through Network Communications or Discrete I/O.
NOTE: The Gun Trigger input has the same effect as
the air flow switch used on manual ProMix 2KS sys-
tems.