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Reference Manual
00809-0100-4696, Rev AA
September 2004
Rosemount 848L
3-20
Logic Execution Timing
The Logic transducer block reads the hardware inputs, processes the
equations and drives the outputs on a continuous cycle. The cycle time or
frequency of execution will vary depending on the number and type of logic
functions used in the equations.
DISCRETE INPUT
BLOCKS
The DI blocks are used to communicate the current value of a contact, the
state of one of the Boolean equations, or the state of an output. The DI block
chooses the value through the Channel parameter. Alternatively, the DI block
can be configured to pass 8 values in a packed format to the host system
(DeltaV) by using channels 7 to 41. To set the channel number use the
following procedure for each DI block.
1. Set MODE_BLK.TARGET to OOS
2. Select the Channel parameter
3. Select the desired channel number
4. Set MODE_BLK.TARGET to AUTO
Channel 1= “Input 1” Channel 24= “EQ 8”
Channel 2= “Input 2” Channel 25= “EQ 9”
Channel 3= “Input 3” Channel 26= “EQ 10”
Channel 4= “Input 4” Channel 27= “EQ 11”
Channel 5= “Input 5” Channel 28= “EQ 12”
Channel 6= “Input 6” Channel 29= “EQ 13”
Channel 7= “Input 7” Channel 30= “EQ 14”
Channel 8= “Input 8” Channel 31= “EQ 15”
Channel 9= “DO 1” Channel 32= “EQ 16”
Channel 10= “DO 2” Channel 33= “Output 1”
Channel 11= “DO 3” Channel 34= “Output 2”
Channel 12= “DO 4” Channel 35= “Output 3”
Channel 13= “DO 5” Channel 36= “Output 4”
Channel 14= “DO 6” Channel 37= “Packed Inputs”
Channel 15= “DO 7” Channel 38= “Packed DO”
Channel 16= “DO 8” Channel 39= “Packed EQ1”
Channel 17= “EQ 1” Channel 40= “Packed EQ2”
Channel 18= “EQ 2” Channel 41= “Packed Outputs”
Channel 19= “EQ 3” Channel 42= “Array Inputs” (MDI Only)
Channel 20= “EQ 4” Channel 43= “Array DO” (MDI Only)
Channel 21= “EQ 5” Channel 44= “Array EQ1” (MDI Only)
Channel 22= “EQ 6” Channel 45= “Array EQ2” (MDI Only)
Channel 23= “EQ 7” Channel 46= “Array Outputs” (MDI Only)