Special Remote I/O Communications Timing; Matching Function Codes And Register Numbers - Omron 3G3MV-PDRT2 User Manual

Remote I/O Functions
Fault code Name
22 hex Writing mode error during Inverter operations, a write-request
Note When a communications error occurs, the MSB (most significant bit) of the function code will
be set to "1" in the response.

5-5-2 Special Remote I/O Communications Timing

With special remote I/O communications, it is possible to use all of the SYSDRIVE
3G3MV/3G3RV/3G3FV functions, such as frequency setting, control input setting, error monitoring,
output frequency monitoring, and so on. These functions are utilized by setting the register numbers
and connecting to the various Inverter functions. To use these functions properly, be sure to use the
following method to handle the data and provide a program for switching the communications pro-
cessing.

Matching Function Codes and Register Numbers

■
• In the remote I/O outputs (PLC to Inverter), set the function code, register number, and set data for
the function to be executed.
• Compare (CMP) the function codes and register numbers of the set remote I/O outputs and the
remote I/O inputs (Inverter to PLC). If they agree, proceed to the next process.
Note If data is repeatedly written to the same register number, it cannot be handled. Be sure to keep
performing processes with different function codes or register numbers. If it is necessary to
write repeatedly to the same register number, then alternately write to and read from that regis-
ter. (Handling data is made possible by changing function codes.)
5-18
Content
message was received for a parameter that
is read-only during operation.
An ENTER command was received during
Inverter operations.
A read-requested message was received
during UV detection.
An ENTER command was received during
UV detection.
during F04 (initial memory error) detection,
a write-request message other than con-
stant initialization, was received.
A write-request message was received for
a read-only register.
Chapter 5
Countermeasure
Perform write operations
after stopping the Inverter.
Perform write operations
after clearing the UV (main
circuit undervoltage) error.
After constant initialization
has been performed, turn
the power supply OFF and
ON again.
Check and correct the reg-
ister number.