IAI America REXT - Manual (Page 141)

Part 1 Specification
Chapter 3 Gateway R unit
117
Part 1 Specification
3.8.5 Command Transmission
A command transmission chart is shown below.
The Gateway R unit analyzes each request command and returns a response every time the replacement of control/status
data of all axes, which is performed constantly, is completed.
The PLC and Gateway R unit perform the following actions:
[1] Upon detecting a response command with zero set in it, the PLC application sets the necessary request command and
data.
[2] Upon detecting the change of the request command to a value other than zero, the gateway sends the request data to the
applicable axis.
[3] Upon receiving a response from the applicable axis, the gateway outputs the response result.
[4] Upon confirming the response result, the PLC application clears the request command.
[5] Upon detecting the clearing of the request command, the gateway clears the response command and waits for the next
command.
[1] to [5] are repeated if commands are used consecutively.
䠄 3/& 䊻*:䠅
䐟
䐠
䐡
䐢
䐣
PLC request
Gateway response
Request command,
data
Controller command
transmission via the
gateway
Response command,
response data
Response = 0000H
Request = 0000H
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