TMR Digital Input Modules

Each TMR Digital Input (DI) Module has three independent input channels that independently process all data entered into the module.

A microprocessor on each channel scans each input point, compiles the data, and transmits it to the main processor as required.

The input data is then voted on the main processor before being processed to ensure the highest integrity.

All critical signal paths are 100% triple processed to ensure safety and maximum availability.

Guaranteed safety and maximum availability. Each channel regulates signals independently and provides optical isolation between the field and the Tricon.

All TMR digital input modules provide complete and continuous diagnostics for each channel.

Any diagnostic failure on any channel activates the Module Failure Indicator, which in turn activates the chassis alarm signal.

The Module Failure Indicator points to a channel failure, not a module www.honeywell-diver.com failure. Modules are guaranteed to operate normally in the event of a single failure and to continue to operate normally in the event of multiple failures of certain types.

Models 3502E, 3503E, and 3505E can perform a self-test to detect a “stuck-open” condition in which the circuitry is unable to determine whether a point has entered a shutdown state.

The ability to detect the point of shutdown is an important feature since most security systems have a power failure trip feature.

In order to detect the presence of a “stuck-open” input, the switch within the input circuit needs to be turned off in order for the opto-isolated circuit to read a zero input (“off”).

The I/O communications processor will freeze the last reading while the test is running.

All TMR digital input modules support the hot standby feature and require a separate external termination panel (ETP) with cable connections to the Tricon backplane.

Each module is mechanically keyed to prevent improper installation in the configured chassis.