Omega Engineering EN-EIC-325-PCI manual Encoder Interface

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1.GENERAL DESCRIPTION

•The EN-EIC-325-PCI handles four axes of user's encoders. Each user's encoder is directly attached to the Encoder Interface on the card.

•The EN-EIC-325-PCI includes eleven logical inputs, and three general

outputs.

•The EN-EIC-325-PCI is I/O mapped.

1.1.ENCODER INTERFACE

Note: Each of the registers IPC, XPC and SPR, mentioned below, represents an unsigned integer 24 bit number ranging from 0 to 16777215. In case the user needs also negative values, he should refer to 16777215 as –1 and so on, thus changing the range 0 – 16777215 to –8388608 – +8388607

Each Encoder Interface includes the following elements:

1.1.1.IPC

The IPC (Internal Position Counter) is updated continuously according to the input from user's encoders.

The updating of the IPC is affected by the Clock Resolution, that may be set to 1, 2 or 4 Clocks/Cycle.

1.1.2.SOFTWARE OUTPUTS

a.The XPC (eXternal Position Counter) is a latch counter being equalized to the IPC upon user's request – either via PC’s software, or by a hardware (real-time) input.

b."Event Signal" – produced when a pre-defined condition is met.

This software Event Signal is supplied also in the hardware outputs as described in section 1.2.2 / ii. The user may select one of the following as the pre-defined condition that becomes the trigger of the event:

•IPC = SPR

Each Encoder Interface includes an SPR (Set Point Register) being adjustable by the user.

In case the user selects this condition, an event occurs when IPC = SPR.

•IPC Overflow

In case the user selects this condition, an event occurs when there's overflow in the IPC, that is, IPC changes from 16777215 to 0, or vice versa.

•Index

In case the user selects this condition, an event occurs when an index (marker) signal arrives from user's encoder.

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Contents User’s Guide Servicing North America Model Table of Contents Section Each Encoder Interface includes the following elements Encoder InterfaceCards Hardware I/O Software InputsPIN LAY-OUT Encoder InputsFunction Type Pin No Encoders Event Signals and General OutputsLogical Inputs CPP InstallationVB folders Page WinSysPath folder WinSysPath is Page Page Introduction to the Functions Chip Level Functions Card Level FunctionsSetActiveChip Brief Name Arguments in C Syntax Full DescriptionAll the following functions refer to that active chip GetActiveChipInputs Brief Description NameArguments in C Syntax Full Description BriefShort EncoderNumber Short ClocksPerCycle Short EncoderNumberShort Polarity SetIndexPulsePolarityGetIndexPulsePolarity CounterLong SetPoint SetSetPointSetPoint GetSetPointSource SetEncoderEventFlagGetEncoderEventFlag PolarityFlag SetHoldEncoderEventGetHoldEncoderEvent ClearEncoderEventShort OutputsMirror ResetPositionCounterReadPositionCounter Long* PositionCounterAvailable only for RequestPositionCounter Polarity Encoder Counters IntroductionSquare wave signal Input Signals from the EncodersSine wave signal GeneralGeneral SoftwareConnector Wiring for the Inputs Connector Wiring for the Outputs Yes NextFinish WinNTPage Page Page Page Page Page Page Appendix D Product Development WARRANTY/DISCLAIMER Shop online at omega.com
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