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MELSEC-Q
1 OVERVIEW
(1) Sending Data to and Receiving Data from an External Device
The QD51 (-R24) is equipped with the following interfaces.
• QD51
: 2 RS-232 channels
• QD51-R24
: 1 RS-232 channel, 1 RS-422/485 channel
Production instructions, production results and other data can be sent to or
received from a personal computer or other external device connected to the RS-
232 or RS-422/485 interface or the console non-procedurally.
Data such as production results can also be printed out on a printer connected to
the RS-232 interface.
(2) Sending Data to and Receiving Data from the Programmable
Controller CPU
Through the execution of programmable controller access commands
(PCRD/PCWT), the programmable controller CPU device data can be read and
written.
With the programmable controller access commands, data can also be written to
and read from the buffer memory of a special function module or an intelligent
function module.
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