ESC is continuously focused on the safety of our employees and customers. Learn more about our COVID-19 response plan and find answers on frequently asked questions.        Learn More

Channel Types

There are currently 29 channel types to choose from in a configuration. Each channel takes defined inputs that are treated differently depending on the channel type to get a specific output. This article details some of the most commonly used channel types.

IMPORTANT: Using the option “Modbus MSW First” and any of the following channel types requires that the 8864 data controller be installed with firmware version 5.02 or greater. The 8864 must also have the “Ambient” feature enabled.
  • 5-Sigma Theta, 6-Linear Sigma, 7-Wind Speed (Channel Input)
  • 8-Wind Direction (Channel Input), D-Vector Wind Speed, E-Vector Wind Direction
  • F-Scalar Wind Direction, G-Scalar Wind Direction, V-Vector Wind Speed (Channel Input)
  • W-Vector Wind Direction (Channel Input), and Type9/Z-Rainfall Counter  
Each channel has the same basic settings that are applied. Configuration options available for the base settings are shown in Figure 2.

Type settings are specific to the type of channel selected. Only those channel type settings applicable to a configured channel are displayed.

Type A- Standard Averaging: Standard averaging channels calculate averages from voltage or current inputs. As each voltage or current input is scanned, it is scaled linearly to engineering units. Type A- Standard Averaging: Standard averaging channels calculate averages from voltage or current inputs. As each voltage or current input is scanned, it is scaled linearly to engineering units.

J- Merge or K – Average Merge: The Merge channel type allows two channels to be merged into one channel. For the J type Merge channel, he real-time data from two channels are merged and then averaged. This type of channel uses the value of one of two input channels, based on data controller flags.
The K type Average Merge channel merges the results of two input channels at the average time, rather than merging real-time data.

M- Math or P- Average Math: Math channels calculate data according to user-defined equations. The configured equation can use the name of other channels, data controller constants, numerical values, and math functions as operators.
Average math channels perform a similar function, but the calculation is not computed until the time of the average, and the average is formed from the averages (not the instantaneous readings) of the input channels. Any equation using operators other than addition or subtraction will yield different results using this method.

For a more detailed explanation on M and P type channels, and their differences, refer to the following article: Summing Up M & P Math Channels

N- Counter: The Type N (counter) channel was introduced in the ESC|StackVision Version 4.6 release to support the ESC|8864 Data Controller. This new channel type is supported only by the Model 8864 controller with firmware versions of v5.00 or later . Please note that any configuration involving this new channel cannot be downloaded to the controller until the controller is upgraded to the 8864 v5.00 firmware or later.

For a more detailed explanation on how counter channels work and how they can be used, refer to the following article: Counting the Ways to Use ESC Counter Channels

Q- Modbus: A Modbus channel is used to take data from a distributed control system over a Modbus link. A Modbus configuration file must be loaded on the data controller to receive Modbus data.

T- Time On Line or U- Multi-condition Time On Line: Time On Line (TOL) channels provide a method for counting online intervals. These channels are typically used to monitor boiler or scrubber online times.

TOL channels count the number of base average intervals in which a user-configured digital expression is met. The total number of base averages that meet this condition is reported in an extended average.
Multi-condition Time On Line channels allow up to three conditions to be considered when determining online intervals. The three conditions can be linked together with an AND, so that all conditions must be true to determine an online interval, or they can be linked separately with an OR, so that only one must be true for an online interval to be counted.
A condition can be configured as a digital expression, a channel/threshold value or as a combination of the two. If both are configured, the states of each are evaluated as an OR together to determine the condition status.

For additional information regarding the latest version of the 8864 Data Controller, please refer to the 8864 Data Controller User Guide (requires login).

Contact the ESC Support Team for more information on each channel type or help configuring a channel.
 512-250-7901  •

Contact the ESC Sales Team to inquire about purchasing an 8864 or any of the ESC Engineering Services.
512-250-7902  •

The ESC Engineering Staff    Published: 7/11/2018 2:50:12 PM

Questions about the ESC DAS?

We'd love to answer your questions.

Contact Us

New to Data Acquisition Systems?

Check out our helpful animation that teaches the basics of

What is a DAS?