Rockwell Automation AADvance Controller Solutions Handbook - Manual (Page 34)

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1-22 Document: 553631
(ICSTT-RM447J_EN_P) Issue: 09:
Solutions Handbook (AADvance Controller)
Peer-to-Peer
Settings TÜV Certified
Configuration Conditions
Software Board
Definitions:
Dxpai128
Dxpao128
Certified for use over
a single
communication
network or multiple
networks
Certified as safety-related and can be used for safety
critical communications in SIL 3 applications
provided to separate Dxpai128 & Dxpao128 board
definitions are used for safety values, the safety
values from the tw oDxpai128 boards (or digital trip
points from the values) shall have a 1oo2 vote
within the receiving application.
Serial Communication Interface
Two serial ports on each processor module support the following signal modes
depending upon use:
 RS485fd: A four-wire full duplex connection that features separate busses for
transmit and receive. This selection should also be used when the controller is
acting as a Modbus master using the optional four-wire definition described in
Section 3.3.3 of the Modbus-over-serial standard.
 RS485fdmux: A four-wire full-duplex connection with tri-state outputs on the
transmit connections. This should be used when the controller is acting as a
Modbus slave on a four-wire bus.
 RS485hdmux: A two-wire half duplex connection appropriate for or master slave
or slave use. This is shown in the Modbus-over-serial standard.
Time Synchronization (SNTP)
The AADvance controller supports the Simple Network Time Protocol (SNTP)
service that can circulate an accurate time around the network. It can be configured to
operate as a SNTP client or server.
As an SNTP client the controller will accept the current time from external Network
Time Protocol (NTP) and SNTP network time servers. The SNTP clients settings
tell the controller the IP address of the external server; the version of SNTP offered
by the server; and the operating mode for the time synchronization signal that the
processors will use for their real time clock. As a client the processor module can be
configured as a unicast or broadcast client.
The AADvance controller can also fulfill the role of one or more SNTP servers (one
for each processor module) to provide a network time signal throughout the network.
To enable server time on an interface it is necessary to specify the direct broadcast
address for that interface. This works for broadcast or unicast modes and when
configured as a broadcast server it can respond to Unicast requests from clients.
Note: To set up SNTP you need to connect your controller to a suitable network
using one of the Ethernet ports. The network must be connected to an external NTP
server or have NTP loaded on to it.