ICP DAS USA WF-2000 Series User Manual page 7

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Built-in Multi-function I/O
Various I/O components are mixed with multiple channels in a single
module, which provides the most cost effective I/O usage and enhances
performance of the I/O operations.
Built-in Watchdog
Module Watchdog is a built-in hardware circuit that monitors the
operating status of the module and will reset the module if a failure occurs
in the hardware or the software.
Safe value mechanism
Safe value mechanism is a software function that monitors the
operating status of the host, and is used to prevent network
communication problems or host failures. When a host watchdog timeout
occurs, the module will reset all outputs to safe states in order to prevent
any erroneous operations of the controlled target.
I/O Pair Connection
This function is used to create a DI to DO (AI to AO) pair through the
Ethernet. Once the configuration is completed, the WF-2000 module can
poll the status of remote input devices using the Modbus TCP protocol
and then continuously write to local outputs in the background.
Figure 1-1: I/O Pair Connection of the WF-2000
WF-2000 Series Wi-Fi I/O User's Manual (Ver. 1.0, Sep./2012) ------------- 7