3BSE029380R0189 ABB Analog input unit

On the front of all standard S800 I/O modules, there are at least three LEDs (RUN,

WARNING and FAULT) indicating the module status. Additionally output I/O

modules have one LED indicating OSP (Output Set to Predetermined) and some

input modules have one LED indicating PRIMARY. Digital I/O modules have one

LED per channel indicating the current state (on/off) and pulse counter I/O modules

have two or more LEDs per channel. S800L I/O module has one dual color LED

(STATUS) indicating the module status.

All I/O modules have user parameters that can be configured using the engineering

tool.

The reset circuitry keeps the I/O module in Init State until the bus master indicates

that the Modulebus power supply is valid. In addition, the standard S800 I/O

modules are kept in Init State until the module locking mechanism (on the MTU) is

in the locked position.

All output I/O modules implement the Output Set to Predetermined (OSP) function.

The outputs of the I/O module are set to a predetermined value, if the OSP

watchdog timer expires or if the SetOSPState command is received.

The watchdog timer is set by the controller (OSP timer) and is used for ModuleBus

supervision. The watchdog timer is re-triggered every time the correct node address

is decoded (or broadcast). If the watchdog timer expires or if the SetOSPState

command is received, the module enters the OSP state and the active outputs (if

any) are set to their OSP values. The OSP value can be either configured as a

predefined value or set to use the last good value sent.

The output values are kept as long as the module stays in the OSP state. To change

the outputs, the module first has to leave this state. When re-entering Operational

State, the outputs are still kept with their OSP value until new valid values are

written.

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