Failsafe Blocks; Figure 31 - Expansion I/O; Figure 32 - Failsafe Block - Elpro Technologies 915U-2 User Manual

915U-2 Wireless I/O Page 55

Figure 31 - Expansion I/O

Select the following parameters
Name - The Module can be named to help with configuration or use the default, up to
30 characters including spaces.
Device ID – Select the Address of the expansion I/O module. Address must be the
same as the address on the rotary switch on the bottom of the 115S expansion I/O
module.
Device Type – Select the module type from the drop down list.

4.2.7 Failsafe Blocks

Fail Safe Block configuration allows registers to be set to a pre configured value on
start-up as well as configuring the outputs to reset to a predefined value after a timeout
period has elapsed, when the real value comes in it will update as normal. Also if the
value is lost because of a communication problem it can be configured to set the output
to a failsafe value after the pre-configured time.

Figure 32 - Failsafe Block

In the screen shot above, register 40501 is an analog value that has been mapped from
another module, it has an update interval of 1 minute.
On start-up this module will write a value of 16535 into register 30501 and then start
counting down from the "Timeout" value (in this case 600 seconds).
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