Panasonic FP7 Series User Manual page 126

8.4 MODBUS RTU Master Communication (SEND)
● Master communication is only enabled when MEWTOCOL or MODBUS is selected. Confirm
that the "master communication clear to send flags" (X90 to X9F) are ON for the
corresponding connection, and execute the SEND/RECV instruction.
● The SEND or RECV instruction cannot be executed for the connection for which the master
communication is in progress. Confirm that the "master communication sending flags" (Y90
to Y9F) are OFF, and execute the instruction.
● The SEND or RECV instruction cannot be executed for the connection for which the slave
communication is in progress.
● Up to 16 SEND/RECV instructions can be executed simultaneously for differing connections.
● For communication between LAN ports of FP7, specify "U1" for the partner station number.
The receiver is determined by the IP address.
● As the communication cassette (Ethernet type) has an Ethernet-serial conversion function, the
internal interface operates with similar programs as the case of the CPU with built-in SCU. The
setting method and programming method are different from those for the CPU with built-in ET-
LAN. Refer to the section describing the case of SCU.
■
Flag operations
Name
SR7
SR8
(ER)
8-30
Description
To be set in the case of out-of-range in indirect access (index modification).
To be set when the source range is outside the accessible range.
COM port or connection specified by UNITSEL does not exist, or communication is not
possible in the specified connection.
Data device specified by [S] is invalid, or exceeds the area.
Sent data amount specified by [n] is invalid.
Station number specified by [D1] is out of the range.
Data device specified by [D2] is invalid, or exceeds the area.
Result storage device specified by [D3] is invalid.
Integer specification for [D2] is only available for the MODBUS direct address specification
type. It is invalid for other types.
Specified bit devices for [S] and [D2], and/or specified 16-bit device, differ.
WUME-FP7COM-07