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.

System Operation

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.

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Graco TI12553a Typical PLC Interaction with ProMix 2KS, Start Mixing, Stop Mixing, Color Change, Gun Trigger Input
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