Chapter 7 Appendix 7.2 Extension SIO Features
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7.2.3 Caution
(1) Regarding RS-485 Communication
As RS-485 Communication is a half-duplex communication, switching process to make receiving
available is conducted after data sending in the controller. Therefore, it is necessary to add a
standby time (for 3ms or more) before sending the next command after receiving a response in
the host side.
(2)
Regarding IAI Protocol Communication Features
Only one channel in the execution command is valid also when use of multiple channels is
permitted. The execution command is valid in the priority
(*1)
in MANU Mode, valid only in I/O
parameter setting channel in AUTO Mode, and no response in other invalid channels.
(Communication disconnected in teaching tools and PC software)
Construct the user system in order to have only one channel to send the execution command.
When connecting a teaching tool or PC software to a channel not selected as the IAI protocol
execution command valid channel (I/O Parameter No. 116) in AUTO Mode, it is necessary to use
a software with the version at or later than that indicated in the list of tool versions applicable for
extension SIO.
Also, as only monitor operation (data inquiry) is available, when conducting active operations
such as edit or startup, set as the execution command communication valid channel in this
parameter. Pay attention as having an active operation without setting as the valid channel will
disconnect the communication.
*1 Priority: (Teaching Port) > (EtherNet) > (Extension SIO)
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