Item | Description |
Encoding | Selecting the BCD option from the dropdown menu enables binary-coded decimal encoding. With this mode enabled, a binary sequence will represent the analog tag’s value. Note that binary-coded decimals do not function like converting a decimal number to binary.
This option is only available for data types SINT (INT8), INT (INT16), DINT (INT32), USINT(UINT8), UINT (UINT16), UDINT (UINT32).
|
Clamp Mode | This option dictates how the tag will handle values outside of the specified maximum/minimum values. Note that this setting only applies to write requests and will not change values read from the PLC. |
Clamp High | To use this feature, select Clamp High from the dropdown menu. Next, enter the desired Engineering Max value. Any tag value greater than the assigned Engineering Max value will be overwritten to the Engineering Max value. |
Clamp Low | To use this feature, select Clamp Low from the dropdown menu. Next, enter the desired Engineering Min value. Any tag value less than the assigned Engineering Min value will be overwritten to the Engineering Min value. |
Clamp Both | To use this feature, select Clamp Both from the dropdown menu. Next, enter the desired Engineering Max and Engineering Min values. Any tag value greater than the assigned Engineering Max value will be overwritten to the Engineering Max value, and any tag value less than the assigned Engineering Min value will be overwritten to the Engineer Min value. |
Reject High | To use this feature, select Reject High from the dropdown menu. Next, enter the desired Engineering Max value. Any tag value greater than the assigned Engineering Max value will be discarded, and the tag value will remain at the last recorded tag value. |
Reject Low | To use this feature, select Reject Low from the dropdown menu. Next, enter the desired Engineering Min value. Any tag value less than the assigned Engineering Min value will be discarded, and the tag value will remain at the last recorded tag value. |
Reject Both | To use this feature, select Reject Both from the dropdown menu. Next, enter the desired Engineering Max and Engineering Min values. Any tag value greater than the assigned Engineering Max value will be discarded, and the tag value will remain at the last recorded tag value. Any tag value less than the assigned Engineering Min value will be discarded, and the tag value will remain at the last recorded tag value. |
Deadband Type | Filters the original input data and discards any new input data within a specified range of the last recorded tag value. |
Absolute | To use this feature, select Absolute from the Deadband dropdown menu. Next, assign any numeric value in the Deadband field. If the absolute difference between the current tag value and the last recorded tag value is greater than the Deadband value, the tag's current value is sent. If the absolute difference is less than the Deadband value, the current value is filtered. Example: Select a DINT tag type and an Absolute Deadband type. For a Deadband of 10: Last Recorded Tag Value: 40 Current Tag Value: 12 Absolute Difference = |Last Recorded Tag Value - Current Tag Value| For this case, the absolute difference between the two tags is 28. The absolute difference is higher than the Deadband, so the current tag value will be recorded. Next, say that the last recorded tag value remains at 40 with a new current tag value of 32. The absolute difference in this case would be less than the deadband, so the current tag value would be filtered, and the tag value would remain as the last recorded tag value. |
Percent | To use this feature, select Percent from the Deadband dropdown menu. Next, assign a numeric value between 1 and 100 in the Deadband field. If the percent difference between the current tag value and the last recorded tag value is greater than the Deadband value, the tag's current value is sent. The current value is filtered if the percent difference is less than the Deadband value. Example: Select a DINT tag type and a Percent Deadband type. For a Deadband of 10: Last Recorded Tag Value: 40 Current Tag Value: 12 Percent Difference = |Last Recorded Tag Value - Current Tag Value| /(Last Recorded Tag Value) * 100 For this case, the percent difference between the two tags is 70%. The percent difference is higher than the Deadband, so the current tag value will be recorded. Next, say that the last recorded tag value remains at 40 with a new current tag value of 37. The percent difference in this case would be less than the deadband, so the current tag value would be filtered, and the tag value would remain as the last recorded tag value. |
Scale Mode | Converts the original input data into a new value using one of four methods. |
Linear Range | To use this feature, select Linear Range from the dropdown menu. Next, enter the desired Raw Low, Raw High, Scaled Low and Scaled High values. With this option, the tag value will be linearly scaled such that the Raw Low is converted to the Scaled Low, and the Raw High is converted to the Scaled High. Intermediate values are scaled linearly. For a given input (raw) value, the exact output (tag) value can be calculated using the formula below: Tag Value = (Input Value – Raw Low) / (Raw High – Raw Low) * (Scaled High– Scaled Low) + Scaled Low Example: Select a REAL tag type. Set the Raw Low to zero and the Raw High to one. Set the Scaled Low to zero and the Scaled High to 100. Now, PLC values (on the left) will be converted to the following tag values (on the right): -17.0 becomes 0
0.0 becomes 0
0.25 becomes 25
0.75 becomes 75
1.0 becomes 100
24.0 becomes 100 Any input value below the Raw Low will be converted to the Scaled Low. Any input above the Raw High will be converted to the Scaled High. For a given tag value, the corresponding input value can be calculated using the formula below: Input Value = (Tag Value – Raw Low) / (Scaled High – Scaled Low) * ( Raw High– Raw Low) + Raw Low |
Linear Slope | To use this feature, select Linear Slope from the dropdown menu. Next, enter the desired Slope and Intercept values in their respective fields. With this option, the tag value will be calculated using the formula below: Tag Value = (Input Value * Slope) + Intercept Example: Select an analog tag with data type UINT. For a Slope of 0.1 and an Intercept of 10: Minimum value: (0 * 0.1) + 10 = 10,
Maximum value: (65535 * 0.1) + 10 = 6563.5 For a given tag value, the corresponding input value can be calculated using the formula below: Input Value = (Tag Value – Intercept) / Slope |
Square Root | To use this feature, select Square Root from the dropdown menu. Next, enter the desired Raw Low, Raw High, Scaled Low and Scaled High values. With this option, the tag value will be exponentially scal’s memory. Note: Be careful to avoid overlapping device addresses. For example, if one string tag “STR1” begins at address D00 on a CIMON PLC, and another string tag begins at address D07, then STR1 should be no longer than 14 characters (7 words * (16 bits/word) / (8 bits/character) = 14 characters). Otherwise, editing one string may affect the other. |
Add Comment