9. easyE4 inside
9.3 Timing characteristics of expansion devices
9.3 Timing characteristics of expansion devices
When the outputs and inputs on expansion devices are written to and read respectively
via easyConnect, the corresponding process will not be synchronized with the program
cycle. In fact, if the easyConnect cycle is more than twice as fast as the program cycle,
the inputs and outputs will be refreshed with every program cycle.
If, on the other hand, the easyConnect cycle is slower than half the program cycle, the
inputs and outputs may be refreshed after two program cycles instead.
Digital expansions
l The time it takes to write data to the outputs on a digital expansion and read its
inputs is typically 0.6 ms.
l Eleven digital expansion devices typically require 6 ms in order for all outputs to be
written and all inputs to be read.
Analog expansions
l The data for an analog device with four inputs and two outputs will typically be
refreshed in 1.5 ms.
As for mixes of digital and analog devices, the following example is meant to illustrate
the corresponding time response: With two digital expansion devices and two analog
expansion devices, the easyConnect cycle would be 4.1 ms.
easyE4 11/18 MN050009 EN www.eaton.com
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