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C-14

Appendix C Scanner

2000 microEFM

5. Set the XD-SCALE parameter. This setting denes the input values from the transducer block (input

range of sensor) that correspond to 0% and 100% values in AI function block calculations. When the

desired output is the measured variable (L_TYPE is set to direct), set the XD_SCALE to represent the

operating range of the sensor. When an inferred measurement is made based on the sensor measurement

(L-TYPE is set to indirect), set the XD_SCALE to represent the operating range that the sensor will see in

the process.

6. Set the OUT-SCALE settings in accordance with the XD-SCALE 0 and 100% points. This setting denes

the output values corresponding to 0% and 100% values in the calculation inside the AI function blocks.

a. If scaling is not required, enter the same values that were entered for the XD-SCALE parameter in the

EU _100 and EU_0 subparameter elds.

b. If the measured or calculated value must be scaled to provide the desired output (and the L-TYPE

parameter is set to indirect), enter the values that correspond with 0% and 100% of the output range in

the EU _0 and EU_100 subparameter elds, and enter the appropriate output unit in the UNITS_IN-

DEX eld.

7. Congure alarms, if desired.

a. Set value limits for high (HI_LIM) alarms.

b. Set value limits for high high (HI_HI_LIM) alarms.

c. Set value limits for low (LO_LIM) alarms.

d. Set value limits for low low (LO_LO_LIM) alarms.

e. Set a priority level for each alarm, as appropriate, by selecting a numeric code from the ve priority

levels supported:

0 = alarm not used

1 = alarm is recognized by the network, but is not reported to the user

2 = alarm is reported to the user

3-7 = advisory alarms of increasing priority, with 7 being the highest priority

8-15 = critical alarms of increasing priority with 15 being the highest priority

8. Repeat steps 1 to 7 for each of the other AI blocks, as required.

9. Change the mode (Target) of each AI block to Auto.

Control Loop Design

When the AI blocks have been congured, the user may proceed with linking function blocks to build a

process control loop and conguring scheduling of block executions. These activities are not specic to the

Scanner 2000 and are outside the scope of this manual. See the host manual or conguration tool manual for

assistance.

NOTE The maximum time required to execute a Scanner 2000 AI block is 30 ms.

When control loops are congured, the network conguration must be downloaded to the network. See the

host manual or the conguration tool manual for instructions.

Cameron Scanner 2000 microEFM User Manual

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