Pid Blocks; Link Active Scheduler / Back-Up Las; Threshold Adjustment; Sample Configurations - K-TEK AccuTrak AT100 Installation & Operation Manual

5.0 COMMUNICATION OPTIONS

5.3.8 PID Blocks

The AT transmitter is equipped with 5 PID (Proportional, Integral, Derivative) Blocks. These blocks can be
used to implement control algorithms within the transmitter. The output of the PID Block can be linked to the AO
(Analog Output ) Block of another instrument like a valve or to the input of another PID Block.

5.3.9 Link Active Scheduler / Back-up LAS

The AT transmitter is designed as a Link Master (LM) class device. With this feature, the instrument can
become a fully functioning Link Active Scheduler (LAS) in the event that the primary LAS (typically the host system)
fails. The device must be configured as the Link Master to take advantage of this functionality.
5.3.10 Setting Up the Strapping/Linearization Table (Requires /S option)
The Linearization/Strapping table is configured via the LIN_LENGTH, LIN_X, and LIN_Y parameters of the
Transducer Block. To configure the table, set the LIN_LENGTH parameter to the number of desired table points (1-
26). The input to each point should then be set to a LIN_X value, and the output to each point should be set to a
LIN_Y value. Note: The Linearization table can only be configured when the Transducer Block is set to Out of
Service (TRANSDUCER.MODE_BLK.ACTUAL=OOS).

5.3.11 Sample Configurations

5.3.11.1 Level Indication in Percent
A simple application of the AT100 transmitter will be to return a level indication as a percentage. With a
desired range of 48 inches of level, the following configuration could be used:
AI.L_TYPE must be "INDIRECT" (to use XD_SCALE->OUT_SCALE mapping)
AI.XD_SCALE.EU_0 = 0 (in)
AI.XD_SCALE.EU_100 = 48 (in)
AI.XD_SCALE.UNITS_INDEX="in"
AI.OUT_SCALE.EU_0 = 0 (%)
AI.OUT_SCALE.EU_100 = 100 (%)
AI.OUT_SCALE.UNITS_INDEX = "%"
5.3.11.2 Offsetting a Measurement
Using the same example in section 1, the level indication can be changed to return an offset
measurement instead of a percentage using the following configuration:
AI.L_TYPE must be "INDIRECT" (to use XD_SCALE->OUT_SCALE mapping)
AI.XD_SCALE.EU_0 = 0 (in)
AI.XD_SCALE.EU_100 = 48 (in)
AI.XD_SCALE.UNITS_INDEX="in"
AI.OUT_SCALE.EU_0 = 12 (in)
AI.OUT_SCALE.EU_100 = 60 (in)
AI.OUT_SCALE.UNITS_INDEX = "in"
AT100-0200-1 Rev L (10-2010) DCN0528 18