8521-LC-MT Controller redundancy

Description

Controller redundancy8521-LC-MT 8521-LC-MT 8521-LC-MT
Redundant controllers can be used for critical control applications. The redundant controller pair operates in parallel, checking
status multiple times through the processing
loop enabling the backup con-troller to continuously monitor the health of the master
controller, assuring a rapid and bumpless
transfer to the standby controller.
Network redundancy
In addition to controller redundancy, the
MOST Logic Controller has two high-speed
Ethernet ports to provide security of communication. Each port can be connected to an
independent LAN which is continuously monitored for its integrity. If the primary port detects
a network failure, traffic is immediately
switched to the other LAN to maintain full communication.
Executable control programs
The control programs are held in nonvolatile memory to enable them to be
restored automatically after power cycling
of the controller. The use of a redundant
controller also enables a new control program to be downloaded to the standby unit
while the process continues. When the
download has been completed and verified, the standby can be switched to master
status to employ the new program.
Remote Modbus Devices
The MOST Logic Controller communicates
via Modbus TCP over Ethernet and can
operate in either Modbus Master or
Modbus Slave mode to communicate with
remote MODBUS devices. Each controller
also has 2 serial ports that can be configured as a Modbus Master to control and
obtain information from Modbus Slaves and
other serial devices, such as weighscales,

8521-LC-MT