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20
DeviceNet Communications Interface
Polled Inputs and Outputs
The Poll command is a message that is transmitted by the Master. It is directed towards a single,
specific Slave (point-to-point connection). A master must transmit a separate Poll message for
each one of its Slaves that are to be polled. The Poll-Response is an I/O message that the Slave
transmits back to the master when the Poll Command is received. Within the Slave the two
messages are received/transmitted by a single Connection Object. It can be considered to be a
data-exchange.
The 890 supports a single Assembly Object for Polled I/O. This is configured using DSE.
The example above defines an Assembly Object consisting of 2 Input registers and 1 Output
register. The input size is 5 bytes (4 + 1) and the output size is 2. The matching PLC
configuration is:
Содержание 8903/DN
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