To Next PageTo Next PageWhy am I getting many communication errors with Acromag Control Unit?
To resolve communication issues with the Acromag Control Unit, ensure that the distance between any two Ethernet nodes does not exceed 100 meters when using approved cable. Also, using shielded CAT-5/5E cable or equivalent is recommended. Finally, make sure to connect earth ground to the TB3 GND terminal, which is located adjacent to the power terminal.
Why Acromag Bus Works 900EN outputs don’t stay shutdown after fault?
If the outputs of your Acromag Control Unit don't stay shut down after a fault, with the GSRC register bit clear, it might be because the internal refresh cycle is enabled. Disable the Auto Output Refresh cycle to ensure outputs remain shut down after a fault.
How to troubleshoot green RUN LED not lighting up on Acromag Bus Works 900EN Control Unit?
If the green RUN LED on your Acromag Control Unit is not lighting up, start by rechecking all power connections to ensure they are secure. If the issue persists, it could indicate an internal problem such as a failure of the +3.3V power supply or a fatal processor error, or even a failed Input Power TVS due to a voltage surge. In such cases, the unit should be returned for repair. Ensure that the power supply is externally fused or current-limited to a safe operating level, no less than twice the maximum input current.
Why are the outputs not working on my Acromag Bus Works 900EN?
If the outputs on your Acromag Control Unit are not working, first ensure that an external excitation supply is connected between the EXC+ and Return (RTN) terminals to power the output circuit. Use the Self Test feature (Utility Page) to verify I/O operation, after unplugging the terminals. Outputs may shut down due to over-current, temperature, and voltage faults, so review the I/O Config Page for potential issues. If the output TVS has failed due to sustained over-voltage, the unit must be returned to the factory for repair.
What to do if Acromag Control Unit's green RUN LED is continuously flashing?
If the green RUN LED on your Acromag Control Unit is continuously flashing, the unit may be in “wink” mode. To verify this, read the Unit Status register. To toggle wink mode off or on, write 5555H to the Wink Mode Toggle Register. Alternatively, a continuously flashing green RUN LED can also indicate that the unit failed to boot the firmware. If you are sure you are using a good network connection and proper power voltage, the unit may require repair.
What to do if communication to Acromag Bus Works 900EN Control Unit is lost?
If you lose communication with the Acromag Control Unit, try resetting it by cycling the power. The communication might have been interrupted by severe interference or shock.
Why are the inputs on my Acromag Bus Works 900EN not reading back the correct OFF state?
If the inputs are not reading back the correct OFF state on your Acromag Control Unit, it could be because the excitation voltage is below 8V, or the inputs are tri-stated and floating. To resolve this, connect an excitation voltage, or pull the input signal up above the 4.3V maximum input threshold as required.
What causes Acromag Bus Works 900EN Control Unit to fail I/O self test?
If the Acromag Control Unit fails the I/O self-test, ensure that field wiring has not been left connected, and that no outputs are turned ON. Also, check that inputs are not tri-stated, and that proper excitation voltage (8-28V) is present. Inputs must pull above the 4V threshold in the OFF state to read as OFF. Do not tri-state inputs prior to this test. I/O requires proper excitation voltage (8-28V) to function.
How to solve cannot communicate issue with Acromag Bus Works 900EN?
If you cannot communicate with the Acromag Control Unit, the IP address of the unit or host PC might be incorrect. Change the IP address of the unit or host PC so they both match. You can try the default unit address of 128.1.1.100.
General| Model | 900EN Series |
|---|---|
| Type | Ethernet I/O Module |
| Manufacturer | Acromag |
| Product Line | BusWorks |
| Mounting | DIN Rail |
| Communication Protocol | Modbus TCP/IP |
| Input/Output Types | Analog Input, Analog Output, Digital Input, Digital Output, RTD Input, Thermocouple Input |
| Isolation | 1500V AC |
| Certifications | CE, UL |
| Number of Channels | Varies by model (typically 8-16 channels) |
