Rockwell Automation Publication ICSTT-RM447M-EN-P - July 2019
57
Controller Functionality
Chapter 3
Serial Communication
Interface
Two serial ports on each processor module support the following signal modes
depending on their use:
• RS485fd: A four-wire full duplex connection that features different
busses for transmit and receive. This selection must also be used when
the controller is acting as a MODBUS Master using the optional four-
wire definition specified 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 must be used when the controller is
acting as a MODBUS Slave on a four-wire bus.
• RS485hdmux: A two-wire half duplex connection applicable for or
master slave or slave use. This is shown in the MODBUS-over-serial
standard.
Time Synchronization SNTP
The AADvance controller can be configured to operate as an SNTP client or
server or both.
• The SNTP client settings inform the controller of the following
information: the IP address of the SNTP 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. The processor module can be configured as a unicast or broadcast
client.
• The AADvance controller can also fulfill the role of an SNTP server. To
enable serving of time on an interface, you need to enable the interface
and then you need to specify the direct broadcast address for that
interface. This works for broadcast or unicast modes. When the
controller is configured as a broadcast server, the controller can still
respond to unicast requests from clients.
• Configure the controller as both a client and a server if using an external
time server and you want to use the controller to supply the time data to
other controllers and devices.
MODBUS Master
The AADvance controller can be used as a MODBUS Master to one or more
MODBUS Slave devices. Slave devices can include programmable logic
controllers, remote devices (typically with little or no processing ability) and,
more rarely, other functional safety controllers (Trusted or AADvance).
The controller supports the MODBUS RTU and MODBUS TCP protocols,
as well as a subset of MODBUS commands. You can use MODBUS RTU with
point-to-point and multi-drop serial links, and MODBUS TCP with
Ethernet.
IMPORTANT
Changes to the SNTP settings are not active until after the power is cycled.
NOTE
The AADvance controller does not support the MODBUS ASCII protocol.
Summary of Contents for Allen-Bradley AADvance T9110
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