ICS TRIPLEX T9451 24VDC Fault-Tolerant Output Module

Communications

Data is transferred between the TMR Processor and the Communications Interfaces using a

common interface called the Network Variable Manager. When data is read from a Trusted

System, the data is obtained from the local copy maintained on the Communications

Interface, providing a fast response.

Data writes are more complicated. If a data write simply updated the local copy and was

then relayed to the processor, the other Communications Interfaces in the system would

carry different data. This may cause problems for redundant links.

To overcome this problem, when data is written to a Communications Interface, it is first

passed to the TMR Processor and the write is acknowledged immediately by the

Communications Interface (to avoid communications delays). The processor updates its own

database and then sends the data back to all Communications Interfaces so that they all

have the same data. This can take one or two application scans. This means that subsequent

reads will receive the old data immediately after the write, until the new data has been

distributed.

All changes to CI parameters (.ini changes) loaded online do not require a power cycle, and

will take effect immediately. The Communications Interface disconnects all communications

and restarts. Communications is also restarted on an application online update and is shut

down when the application is stopped.

Application

Supported Protocols

Front Panel Serial Port

This port operates at 19200 baud on RS232. A command line diagnostic protocol is available

via this port, accessed using a TC-304-01 Maintenance Cable and a terminal program. This

protocol is not affected by the Processor Front Panel keyswitch.

Rear Serial Ports

These ports may be configured between 1200 and 115200 baud. All four ports support

RS485. port 1 supports RS232 with full handshaking and port 2 supports RS232 without

handshaking. These ports can be allocated as a Modbus Remote Terminal Unit (RTU) Slave or

Master (Modbus Master requires a T8122 or T8123 Processor Interface Adapter).

The ControlLogix 5580 controller incorporates security mechanisms

like centralized authentication and access control to help keep your systems secure. 

We have also received ISO 27001 certification to help protect intellectual property – both ours and yours. 

And our vulnerability-management process aligns to IEC 29147 and 30111.

Include the communication modules you need for connectivity to other networks. 

For this use, a controller is not required. The ControlLogix Gateway integrates

into existing PLC-based systems so that users with existing networks can

send or receive messages to or from other networks.