Rockwell-automation T3411 ICS Regent Monitored Digital Input Modules Manual de usuario descargar pdf (Pagina 3)

Monitored Digital Input Modules

(T3411)

6031

Mar

wired back to the field power supply return. Optionally a line

monitor device can be connected across the input switch in the

field (as shown in Figure

The input module monitors the voltage of the input circuit

after the internal dropping resistor, comparing it to a

reference voltage generated by the D/A converter inside the

module. The comparator generates an on or off state

depending on which voltage signal is greater than the other.

The field

side FPGA controls and monitors the reference

voltage signal and reads the status of all 16 input

comparators. This information is stored and sent through

optical isolation to the logic

side FPGA. The log

side FPGA

interfaces the input data to the I/O Safetybus and drives the

module’s front panel status LEDs.

Testing and Diagnostics

Standard I/O Module Testing

The processor modules send triplicated read data requests to

the input module over the I/O Safetybus. The processors’

addressing data and data read requests are voted by the

module (preventing I/O Safetybus failures upstream from the

module from affecting its ability to be read). The voted result

is then passed to the I/O bus interface logic.

After receiving the voted data read request, the I/O bus

interface logic sends its input data to the module’s three bus

drivers. Each of the three bus drivers is independently

controlled — preventing failures in a single driver from being

propagated into the rest of the system.

The bus drivers then move the data onto the I/O Safetybus

which, in turn, passes it to the processors.

Each module’s voter circuits are periodically tested by the

processor modules. Discrepant data are sent through one of

three l

egs of the I/O Safetybus to determine whether the

module’s voter is able to outvote the incorrect data. A failure

to return the correct majority

voted result to the processors

produces an I/O module error indication at the processor

modules and a module fault indication at the I/O module.

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