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3. Operation
3. Operation
This chapter contains information on how to use the Fieldbus I/O option after it has been
installed.
3.1 Fieldbus I/O Addressing in SPEL
+
Each of the Fieldbus I/O commands in SPEL+ refer to one device on the network. The bit
number and port number parameters refer to inputs and outputs local to the device.
3.2 SPEL
+
Fieldbus I/O Commands
All Fieldbus I/O commands begin with the same prefix: "FbusIO_". Here are the main
commands. For details, please see the online help or SPEL
+
Language Reference Manual.
FbusIO_GetBusStatus Returns the status of the specified fieldbus.
FbusIO_GetDeviceStatus Returns the status of the specified fieldbus device.
FbusIO_In Returns the status of an 8 bit input port.
FbusIO_InW Returns the status of a 16 bit input port.
FbusIO_IONumber Returns the bit number of the specified Fieldbus I/O label.
FbusIO_Off Turns an output off.
FbusIO_On Turns an output on.
FbusIO_Out Simultaneously sets 8 output bits.
FbusIO_OutW Simultaneously sets 16 output bits.
FbusIO_Sw Returns the status of one input bit.
FbusIO_SendMsg Sends an explicit message to a device and returns the reply.
Response times for Fieldbus I/O can vary and depend on several factors, including baud rate,
scan rate, number and types of devices, number of SPEL+ tasks, communication error, etc.
When the fastest and most consistent response times are required, please use EPSON
Standard digital I/O, which incorporates interrupt driven inputs and outputs.
)
NOTE
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