Prosoft-technology MVI56E-MCMR Manual do Utilizador descarregar pdf (Página 191)

MVI56E-MCMR ♦ ControlLogix Platform Reference

Modbus Communication Module with Reduced Data Block User Manual

ProSoft Technology, Inc. Page 191 of 225

May 13, 2014

In this example, the Master addresses a request to server device. The function

code (01) is for a Read Output Status operation. It requests the status of the

output at address 1245 (04A1 hex). Note that only that one output is to be read,

as specified by the number of outputs field (0001).

If the output address is non-existent in the server device, the server will return

the exception response with the exception code shown (02). This specifies an

illegal data address for the Slave.

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Prosoft-technology MVI56E-MCMR Manual do Utilizador Página 191