Echelon I/O Model Reference for Smart Transceivers and Neu Manual de usuario descargar pdf (Pagina 18)

8 Introduction

The following guidelines for declaring I/O object types apply to the I/O models

shown in

Figure 1 on page 9:

• Up to 16 I/O objects can be declared.

• Timer/counter 1 can be multiplexed for up to four input objects.

• The neurowire, i2c, magcard, magcard_bitstream, magtrack1, and serial

I/O models are mutually exclusive. One or more of a single type of these

I/O models can be declared in one program.

• Because the parallel and muxbus I/O models require all I/O pins for some

Neuron Chips and Smart Transceivers, no other object types can be

declared when either of these objects is declared. You can declare the

IO11 pin as a bit input or output in addition to the parallel or muxbus

object for the following device types: PL 3120-E4, PL 3150, or PL 3170.

For Series 5000 devices, you can also declare the IO11 pin as a bit input

or output in addition to the parallel (master or slave A mode) or muxbus

object; the IO11 pin serves as an IRQ pin for the parallel (slave B mode)

object.

• Direct I/O object types (such as bit, nibble, byte) can be declared in any

combination; see

Overlaying I/O Objects

on page 17. Timer/counter,

serial, and neurowire I/O object declarations override the pin directions of

any overlaying direct I/O object types.

• The quadrature and dualslope input objects cannot be multiplexed with

other input objects on timer/counter 1. The edgelog input uses both

timer/counters and is exclusive of any other timer/counter objects.

• The bitshift I/O objects cannot be declared on the same I/O pins as

timer/counter objects. Direct I/O objects can be overlaid with bitshift I/O

objects. Two adjacent bitshift I/O objects cannot share any I/O pins.

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Echelon I/O Model Reference for Smart Transceivers and Neu Manual de usuario Pagina 18