Product : ISaGRAF V3

Date    : 5-March-1996

File    : Nwadr0.Network address (Modbus 16 bit format) exception.htm

Subject : Network address (Modbus 16 bit format) exception

Keywords: Modbus - network address


The ISaGRAF system does not handle the "0000" network address. On

both development workbench and target system, a null network address

means that no address is defined for a variable. This is due to the

fact that the definition of a network address for a variable is an

optional feature.

So you cannot use the "0000" value in your OEM system. You

absolutely need to implement an offset system, to assume the fact

that the first valid network address is "0001".


Copyright © 1996-2009 ICS Triplex ISaGRAF Inc. All rights reserved.