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PLC Communications without the AIM

PLC Communications without the AIM. REVIEW – Setup PLC/DCS Communications. Note location in chassis. PLC Fieldbus Options. The Q.i can interface with the PLC just like a regular IND780. Useful if Task Expert is driving the process and a PLC is monitoring .

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PLC Communications without the AIM

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  1. PLC Communications without the AIM

  2. REVIEW – Setup PLC/DCS Communications Note location in chassis

  3. PLC Fieldbus Options The Q.i can interface with the PLC just like a regular IND780. Useful if Task Expert is driving the process and a PLC is monitoring. Allows ANY of the PLC fieldbus options to be used (ControlNet, Ethernet/IP, ProfiBus, DeviceNet, and AB-RIO. This is the DEFAULT setting. AIM Driver recommended in this case.

  4. PLC Monitored Task Expert Application Control Occurs Here An application (without an AIM) using DeviceNet, AB-RIO, ProfiBus, Ethernet/IP, or ControlNet

  5. PLC Fieldbus Options Warning! Not all PLC's can use Ethernet/IP's cyclic data. More on this later.

  6. Block Transfer Shared Data Access (IN the PLC! ) Requested numeric Shared Data Variable Name goes here Requested string Shared Data Variable Name goes here Numeric SD Name and result comes back here String SD Name and result comes back here Difficult to implement!

  7. Cyclic Block Shared Data Access (ProfiBus) Integer Floating Point Data Read (PLC) Identical table formats, but at different locations in each table. Note 20 byte limit for string values! Moderate effort to implement!

  8. Cyclic Block Shared Data Access (ProfiBus) Integer Floating Point Data Write (PLC) Moderate effort to implement. Identical table formats, but at different locations in each table. Note 20 byte limit for string values!

  9. ControlNet Class Shared Data Access Shared Data Reference Manual Class Code Note HEX! Instance number is the Scale number Attribute specifies the variable in the class Easy to implement, but limited number of Shared Data Variables

  10. ControlNet Class Shared Data Access Note:Not ALL Shared Data Variables have ControlNet Class Codes. In those cases, those variables cannot be accessed. • Task Expert generally relies on the following Shared Data fields to exchange data with the PLC: • AI – Class 6E Hex, Integers • AJ – Class 6D Hex, Floats • AK – Class 6B Hex, Strings

  11. Ethernet/IP Gotch-ya! WARNING!!! Not all PLC's can use Ethernet/IP cyclic data!!! SLC MicroLogix 1400 MicroLogix 1200 These PLC's can only use discrete message instructions. That means that they cannot directly control a feed by themselves, but MUST use the onboard target logic of the scale, which is more complicated. MicroLogix 1000

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