9. easyE4 inside9.3 Timing characteristics of expansion devices9.3 Timing characteristics of expansion devicesWhen the outputs and inputs on expansion devices are written to and read respectivelyvia easyConnect, the corresponding process will not be synchronized with the programcycle. 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, theinputs and outputs may be refreshed after two program cycles instead.Digital expansionsl The time it takes to write data to the outputs on a digital expansion and read itsinputs is typically 0.6 ms.l Eleven digital expansion devices typically require 6 ms in order for all outputs to bewritten and all inputs to be read.Analog expansionsl The data for an analog device with four inputs and two outputs will typically berefreshed in 1.5 ms.As for mixes of digital and analog devices, the following example is meant to illustratethe corresponding time response: With two digital expansion devices and two analogexpansion devices, the easyConnect cycle would be 4.1 ms.easyE4 11/18 MN050009 EN www.eaton.com 505
