Applies To:
  • CitectSCADA 5.xx
Summary:
Citect normally tries to read the status register S2:0 to check that a unit is on-line. This register might not be present on non-standard ABTCP modules such as terminal I/O or protocol converters. 

Solution:
An extra INI option has been added which allows one of the integer registers to be used to determine whether the unit is on-line instead of the S2:0 register. The INI parameter should be of the form:

AltInitReg=N7:15

... where the first integer is the file number and the second in the element number (this terminology is understood by DH+ people).

Warnings.

One thing to note is that if this option is specified then the alternate register will be used for all on-line checks of DH+ units. Thus, it is not only necessary to ensure that the register exists in the non standard ABTCP device, but also that the register exists in all other DH+ units connected to Citect. If this is not the case, they will be treated as off-line. 
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