Pepper-computer Modular Computers RS485 Bedienungsanleitung PDF herunterladen (Seite 319)

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101

SMART I/O User’s Manual

Chapter 6 Communications Modules

FB_SSI_READ In order that the current state of the encoder

may be read, this command is issued - nor

mally in a loop built into the ISaGRAF cycle.

The read-back value appears in the position

variable.

As can be seen from figure 6.2.11.1.1, the inputs to the module are displayed

on the left-hand side of the SSI block and the outputs are indicated on the

right-hand side.

setpoint This is the register which contains the value of the

setpoint which is sent to the SSI module with the

Command statement.

port The port register is used for setting the port number

of the attached SM-SSI Module.

ctrx The control register elements; for a description of the

earlier.

error If an error occurs then it’s value appears in this

variable.

position The position of the encoder following a read is

recorded in this variable.

statusx The status register elements; for a description of the

earlier.

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