Eaton PowerXL DX-NET-SWD Manual

4 Commissioning4.4 Acyclic data34 DX-NET-SWD 06/13 MN04012009Z-EN www.eaton.com4.4 Acyclic dataFor normal variable frequency drive operation the acyclic data is not required.This section therefore addresses programming experts.4.4.1 IntroductionAcyclic communications are used to read or write parameters and diagnos-tics in the DC1 variable frequency drive; they can take place at the same timeas cyclic data is being transferred. This means that acyclic communicationsare independent from the selected profile.In this case, the SmartWire-DT coordinator (client) communicates with theDC1 variable frequency drive acyclic. The communication is always initiatedby the client in the process.4.4.2 Data TypesSeveral data types are defined for using the PROFIdrive communication.The data types used here are specified in the following.4.4.2.1 PROFIdrive specificN2 – normalized valueN2 = normalized value for a relative scaling. N2 is in the range of -200 % to+200 %. 0 % is equivalent to 0 (0x0), 100 % is equivalent to 212 (0x4000).The representation is carried out in two complements, the most significantbit (MSN) is the first bit after the unsigned bit (SN) of the first octet.SN = 0; positive value with 0; SN = 1; negative numbersConversion￫ In order for acyclic data to be transmitted and diagnostic activi-ties to be performed, the higher-level PLC must feature acyclicservices.The programmable EASY802-DC-SWD and EASY806-DC-SWDswitchgear and controlgear do not feature acyclic services!Coding Value Range Resolution Length113 -200 % ≦ i ≦ (200-2- 14) % 2- 14 ≙ 0.0061 % 2 octetsunsigned bit (bit 15) bit with sign (bit 15)0 dec = 0x0000hex = 0 %1 dec = 0x0001hex = 0.0061 % -1dec = 0xFFFF hex = -0.0061 %16384 dec = 0x4000hex = 100 % -16384dec = 0xC000 hex = -100 %32767 dec = 0x7FFFhex = 199.99 % -32768dec = 0x8000 hex = -200 %