Asycube - Asyril SA
Programming Guide
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use the Asycube HMI to configure the Asycube while a machine PLC controls the Asycube
through Modbus.
The Asycube can only handle one read or write request at a time. If two requests are sent
simultaneously, the second one will be ignored. It is recommended to alternate between the
different read/write requests.
As stated in the Modbus protocol specification, up to 125 registers can be read at once and
only up to 123 registers can be written at once. If more registers need to be read (or written),
you will have to implement multiple read (or write) requests one after the other.
6.2.2. Timing
The Asycube is able to handle one Modbus read or write request every 4 ms. The timing
performance of a Modbus command (e.g. trig the start of a platform vibration) depends on
different factors such as the Modbus master implementation or the Ethernet network state.
Therefore, it is not possible to guarantee neither real-time behavior nor maximal reaction
time. The order of magnitude for the delay between a Modbus command and its effect on the
Asycube is 10 ms. The delay between the instant when a register is written and the instant
when its updated value is read on Modbus typically lays around 15 ms.
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