Analog Input Scaling on SCADAPack in Telepace Studio
Key Takeaway
How to scale analog inputs on SCADAPack RTUs — converting raw 4-20mA counts to engineering units for pressure, flow, temperature, and level.
Quick Answer
SCADAPack analog inputs produce raw counts (0-32000 for 4-20mA). Telepace Studio provides built-in scaling configuration to convert raw counts to engineering units using linear interpolation. Scaled values are stored in registers and reported to the SCADA master via DNP3.
Scaling Configuration
In the I/O configuration tab, set the raw input range (e.g., 0-32000) and engineering unit range (e.g., 0-500 PSIG). Telepace Studio performs linear interpolation automatically.
Manual Scaling Formula
EU = EU_Low + (Raw - Raw_Low) × (EU_High - EU_Low) ÷ (Raw_High - Raw_Low)Wire Break Detection
Configure an alarm threshold below the 4mA live zero (e.g., 3.5mA or raw count below 400). When the input drops below this threshold, trigger a diagnostic alarm indicating a broken wire or failed transmitter.
DNP3 Reporting
Scaled engineering unit values are mapped to DNP3 Analog Input objects and reported to the SCADA master. Configure deadband on the DNP3 object to control change-of-state reporting sensitivity.
For comparison, see Bristol FB300 analog scaling and IDEC FC6A analog configuration.
Frequently Asked Questions
Scaled floating-point values are stored in analog input registers and mapped to DNP3 Analog Input objects for SCADA master reporting.
Configure a low limit alarm below 4mA (typically 3.5mA). When the input drops below live zero, a diagnostic alarm triggers and can be reported via DNP3.