ALPHABETIC REFERENCE EXCEL CARE CONTROL ICONS
74-5577–33 (US) 86
EN2B-0184 GE51 R0518 (Europe)
The following diagram shows an example of how datapoint ID___On_Prio_2
exchanges data between the XFMs.
The value of ID___On_Prio_2 tells XFM 35 if there are any loads that can be
restored (turned on) in priority group 2. If not, XFM 35 will not send out a positive
kW value on output Po2, but send it to Po1. (If ID___On_Prio_1 is 1.)
To explain data exchange operation, start at the output of XFM 35. (There is no
real starting point because the controller implements the XFMs in a cyclic manner.)
XFM 35 writes a 0 to ID___On_Prio_2 to reset it. The first XFM 36-1 will write a 1
to the datapoint, otherwise it writes a 0. Assuming that a 1 was written to the
datapoint, the second XFM 36-1 to execute after XFM 35 reads ID___On_Prio_2.
If the XFM 36-1 has a load that can be turned ON, the XFM 36-1 will read the 1.
The value of 1 tells XFM 36-1 to write a 1 to the datapoint, whether or not the XFM
36-1 to execute has a load that can be turned on. This is to prevent the second
XFM from erasing the 1 generated by the first XFM. The third XFM 36-1 (and
subsequent XFMs in larger programs) work the same as the second XFM 36-1.
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