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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