The automation systems and communications acceptance test, defined in NETA ATS-2025 7.23, is a structured field inspection and functional verification of programmable logic controllers, industrial computers, communications gateways, and other control or data-acquisition hardware before it is placed in service. The test covers six major areas: identification of the unit (manufacturer, model number, style number, software and firmware revision levels); visual and mechanical inspection for shipping damage, corrosion, loose connections, and proper mounting; electrical tests of all enabled digital inputs and outputs to confirm correct logic and signal paths; test records documenting the instrument used and ambient conditions; and a summary space for comments and any deficiencies found. Unlike power-equipment tests that measure a physical property like insulation resistance or turns ratio, the automation acceptance test confirms that the hardware is genuine, complete, undamaged, and responds correctly to control signals before the unit is embedded in the system and becomes difficult to isolate for future troubleshooting.
Automation systems are the nerve endings of modern electrical infrastructure - they monitor substations, manage tap changers, coordinate protective relay action, and enable remote operator command. A logic controller or communications card that arrives with the wrong firmware revision, or that does not respond to a test input, is a liability: it may operate correctly for weeks or months before a subtle logic fault causes a misoperation, a delayed response, or a loss of situational awareness at a critical moment. Confirming the unit's identity, verifying no physical damage in transit, and testing every digital circuit before that unit is wired into the system serves as a quality gate, catching defects and configuration errors when they are still inexpensive to fix rather than after the equipment is commissioned and integrated into operational control logic.
Acceptance: before any automation hardware is powered on and placed in service, as part of the project's electrical acceptance test sequence. The test is performed after procurement but before site integration, either at the contractor's shop or at the project site depending on the specification and logistics. Maintenance: the test is typically not repeated on a fixed interval during the equipment's service life, but rather triggered by hardware replacement, a significant firmware or software update, or a suspected input or output malfunction that warrants hardware verification before software changes are explored.
The automation unit is visually inspected for shipping labels, mounting damage, corrosion, and loose internal or external connections according to the equipment's acceptance form or shop manual. The identification section is filled in: manufacturer name, model and style number from the nameplate are recorded, and the current software revision and firmware revision levels are read from the unit's display or configuration interface and documented. The electrical tests section requires each enabled digital input to be tested by applying the appropriate discrete signal (a switch closure or a hardwired logic state as the input is designed to accept) and confirming the controller responds with the expected output or display change; analog inputs are separately verified with metering tests, comparing the applied value against the reading at the HMI and any remote terminals. Similarly, each enabled digital output is tested by commanding the output to its energized and de-energized state and confirming the relay closes, the LED illuminates, or the field device responds as intended. All findings are recorded on the form, any deficiencies (wrong firmware, a non-functional input, visible damage) are listed, and the date, test instrument identification, and ambient temperature are captured alongside the results.
For identification: manufacturer, model number, style number, equipment designation, and the current software revision and firmware revision levels as read from the unit. For mechanical: any visible damage to the enclosure, corrosion, loose connections, or improper mounting noted during visual inspection. For electrical tests: the result of testing each enabled digital input (pass or fail, and the signal or command applied if relevant) and the result of testing each enabled output (pass or fail, and the command sent and output response observed). Test records include the date, ambient temperature, test instrument make and model, and instrument calibration due date. Comments and deficiencies section captures any hardware damage, non-functional circuits, firmware mismatches, or other findings that affect acceptance.
NETA ATS-2025 7.23 frames the acceptance test as a confirmation gate: the unit must bear a nameplate that matches the project schedule and purchase order; the hardware must show no physical damage or signs of environmental degradation; and each enabled digital input and output must respond correctly when tested per the equipment manual or the functional logic diagram. A unit with wrong firmware, a failed input test, or physical damage is flagged for investigation, repair, or replacement before it is installed into the system. Because automation systems are application-specific, the exact test steps for each input and output are documented in the equipment's acceptance form or integrated into the project specification rather than prescribed in a one-size-fits-all table. See the purchased NETA ATS-2025 standard for the complete section 7.23 and any equipment-specific acceptance form templates.
UltraDb references ASTM, ANSI, IEEE, and NETA standards descriptively, to identify the published methods its forms are built from. UltraDb and Verlecta are not affiliated with, endorsed by, certified by, or licensed by NETA, ASTM, ANSI, IEEE, or Megger. Standard names and section numbers are the property of their respective organizations. Always test to the edition your contract specifies.