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FS-8700-48 Fike Cheetah Manual Page 21 of 36
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4.5.8. Map Descriptor Example 8 – History Data (All Devices)
In this example, 4 Map Descriptors process all history events on all four loops. One Data Array is used and loop #2’s data is stored at
an offset location of 240 (max number of devices per loop) in the Data Array. The Device is set to ALL to tell the driver to process all
devices on the loop using this Map Descriptor. If a history event for device 100 on loop 3 is received then the driver will store the
event code at location 480(=base offset for loop 3)+100 (=device address). The event code will be stored as a number and the
meaning of the number may be obtained by reading Appendix A.4
Map_Descriptor_Name, Data_Array_Name, Data_Array_Offset, Function, Node_Name, Cheet_Zone, Cheet_DT, Cheet_Device, Cheet_Loop
Device1_L1_Hist, DA_HIST, 0, Passive, Node_A, None, History, All, 1
Device1_L2_Hist, DA_HIST, 240, Passive, Node_A, None, History, All, 2
Device1_L3_Hist, DA_HIST, 480, Passive, Node_A, None, History, All, 3
Device1_L4_Hist, DA_HIST, 720, Passive, Node_A, None, History, All, 4
This is how you tell the
driver to use this Map
Descriptor to store history
data as opposed to device
status data (see examples
4-6)
History events relate to
devices and thus the zone
must be set to None.
One Map Descriptor is
required per loop.