FieldServer instruction manual FS-8700-19MetasysN2 Driver Manual

FS-8700-19_Metasys_N2 Driver Manual Page 20 of 51

Appendix A. Advanced Topics

Appendix A.1. Writing to DX9100 Binary Outputs

When writing to DX9100 Binary Outputs, it is important to understand that each binary output has three bits associated with it as described in the table below:

Bit	Description	Address6
Output	The status bit will indicate the actual status of the output in the field. This bit cannot be	Address 5
status bit	modified by the FieldServer as it is read only, and is meant for actual status display.
Output	The control bit will allow the FieldServer to write a command to the DX9100 for the associated	Low	byte	of
control bit	output. This command will only execute if the override is enabled by the override bit.	Address 1
Override bit	The override bit must be set to enable an output to be written to by the FieldServer. If this is	High	byte	of
	not set, then the control bit will be ignored.	Address 1

Example

The example below better illustrates the mapping that is typically needed to deal with DX9100 Binary Outputs. Note that since all 6 outputs are packed into word format when transmitted, a Packed_Bit Array is typically required to access the bits individually. In this Example, the status for BO3-BO8 can be found in offsets 0-5 of DA_PO1_02, the control bits can be found in offsets 0-5 of DA_PO1_01, and the override bits can be found in offsets 8-13 of DA_PO1_01.

Data_Arrays
Data_Array_Name,		Data_Format,	Data_Array_Length
DA_PO1_01	,	Packed_Bit ,	100
DA_PO1_02	,	Packed_Bit ,	100
Map_Descriptors

Map_Descriptor_Name,	Data_Array_Name,	Data_Array_Offset,		Function,	Node_Name,	Address,	Scan_Interval
CMD_DO1_05 ,	DA_PO1_01 ,	0	,	Rdbc ,	Dev_30 ,	0001 ,	1.0s	//	DO3 - DO8 Set and Enable
CMD_DO1_06 ,	DA_PO1_02 ,	0	,	Rdbc ,	Dev_30 ,	0005 ,	1.0s	//	DO3 - DO8 Status

6Binary Outputs start at address 3, so the first bit of each of these addresses will represent B03

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