Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 301)

SMART I/O User’s Manual

Chapter 6 Communications Modules

6.2.5 Functional Description

Figure 6.2.5.1: SM-SSI Schematic Diagram

The Synchronous Serial Interface working together with a photographically

etched encoder disk allows absolute codes (positions) of rotating axis to be

continuously monitored. The greatest advantage of the SSI communication

process compared to that of standard serial/parallel procedures is that the

controller actually regulates the timing and speed of the data transmission

which further optimizes data security.

Simplicity in design with low conventional component count coupled with

the inherent safety offered through accurate axis position reading even after

power fail, enable this compact module to be utilized for equipment operat-

ing even in extreme environmental conditions.

SSI

Interface

Comparator

Comp. Value

(24-bit)

Configuration

Control

Logic

Status

Board ID

Last Value

(24-bit)

OPTO

RC +

Schmitt

RC +

Schmitt

SPROM

LED 1

Match

BU1

Analog

SSI

End of

range

switches

Encoder

Control

Match

FPGA

LED 0

Data Flow

Data

SPI Bus

P1-5

Clock +

Clock -

Data +

Data -

EOR1

EORCOM2

EOR2

Direction

Reset

Com+

BU1

SPI

I/O

Lines

Reset

Line

Int

Line

VCC

GND

STXD

SRXD

SCLK

SCS

NRESET

NINT

SPI

Interface

Selection

Decoder

EEPROM

1 2 ... 296 297 298 299 300 301 302 303 304 305 306 ... 319 320

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