Troubleshooting
3.Visually inspect the cable and connector. Ensure that contact is good at both ends, that the pins are not bent, the cable is not crimped, and the cable covering is intact.
4.Retry the connection using a different cable.
Figure 11-1 DeviceNet connector
11.7.2Checking grounding
The sensor / transmitter assembly must be grounded. See your sensor installation manual for grounding requirements and instructions.
11.8Zero or calibration failure
If a zero or calibration procedure fails, the transmitter will send a status alarm indicating the cause of failure. See Section 11.12 for specific remedies for status alarms indicating calibration failure.
11.9Fault conditions
If a fault is reported, determine the exact nature of the fault by checking the status alarms (see Section 7.6). Once you have identified the status alarm(s) associated with the fault condition, refer to Section 11.12.
Some fault conditions can be corrected by cycling power to the transmitter. A power cycle can clear the following:
•Zero failure
•Stopped internal totalizer
11.10Simulation mode for process variables
Simulation allows you to define arbitrary values for mass flow, temperature, and density. Simulation mode has several uses:
•It can help determine if a problem is located in the transmitter or elsewhere in the system. For example, signal oscillation or noise is a common occurrence. The source could be the PLC, the meter, improper grounding, or a number of other factors. By setting up simulation to output a flat signal, you can determine the point at which the noise is introduced.
•It can be used to analyze system response or to tune the loop.
114 | Micro Motion® Model 2400S Transmitters for DeviceNet™ |
