Pepper Computer RS232, RS485 user manual Setpoint Port Ctrx Error Position Statusx

Chapter 6 Communications Modules SMART I/O User’s Manual

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

port

ctrx

error

position

statusx

This is the register which contains the value of the setpoint which is sent to the SSI module with the Command statement.

The port register is used for setting the port number of the attached SM-SSI Module.

The control register elements; for a description of the register please refer to the relevant section appearing earlier.

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

The position of the encoder following a read is recorded in this variable.

The status register elements; for a description of the register please refer to the relevant section appearing earlier.

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October 01, 1996 ©1996 PEP Modular Computers GmbH Page 6 - 37