Allen Bradley 5380 Safety output 5069-OBV8S Circuit Fault

PLC (Programmable Logic Controllers) Allen Bradly
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Allen Bradley 5380 Safety output 5069-OBV8S Circuit Fault

I recently encountered a red output light on my Allen Bradley 5380 safety digital output (5069-OBV8S) indicating a circuit fault. How can I program an alarm to notify the HMI when this occurs again?

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To program an alarm to notify the HMI when a circuit fault occurs on your Allen Bradley 5380 Safety output (5069-OBV8S), you’ll need to follow these steps:

Identify the Fault Condition:

  • Determine how the 5069-OBV8S module reports the circuit fault. Typically, this information is available through a status tag in the controller. Create a Fault Monitoring Routine in the PLC:
  • Use the status tag associated with the 5069-OBV8S to monitor the fault condition in your PLC program. This might involve checking a specific bit that indicates a fault. Set Up an Alarm Bit:
  • When the fault condition is detected, set an alarm bit in your PLC program. This bit will be used to trigger the HMI alarm.

Configure the HMI Alarm:

  • Set up an alarm in your HMI software (e.g., FactoryTalk View) that monitors the alarm bit you set in the PLC.

Here’s a more detailed step-by-step process:

Step 1: Identify the Fault Condition

Check the Module Status Tags:

  • The 5069-OBV8S module has status tags that indicate various conditions, including faults. Refer to the module’s documentation to identify the specific tag and bit that indicates a circuit fault.

Step 2: Create a Fault Monitoring Routine

Open Your PLC Program:

  • In Studio 5000 Logix Designer, open the program for your 5380 controller. Add a New Routine:
  • Create a new routine or use an existing one where you will monitor the fault status. Monitor the Fault Bit:
  • Use a GSV (Get System Value) instruction or directly access the status tag to check for the fault condition. For example:

ladder configuration

GSV
    Class Name: Module
    Instance Name: "YourModuleName"
    Attribute Name: "FaultCode"
    Dest: FaultStatus
  • If FaultStatus indicates a fault (non-zero), set an alarm bit:

ladder ladder configuration

XIC FaultStatus OTE AlarmBit

Step 3: Set Up an Alarm Bit

Define an Alarm Bit:

  • Create a new Boolean tag in your PLC program, e.g., AlarmBit. Set the Alarm Bit:
  • In your fault monitoring logic, set this bit when a fault is detected.

ladder configuration

XIC FaultStatus OTE AlarmBit

Step 4: Configure the HMI Alarm

Open Your HMI Software:

  • Open FactoryTalk View Studio or your preferred HMI configuration software. Create a New Alarm:
  • Go to the Alarm Setup section and create a new alarm. Configure the Alarm to Monitor the Alarm Bit:
  • Set the trigger for the alarm to be the AlarmBit tag in your PLC. Set Alarm Properties:
  • Define the message and any other properties for the alarm, such as priority and acknowledgment requirements.

Example in FactoryTalk View:

Add a New Alarm:

  • Go to Alarms and Events > Alarm Setup > Digital Alarms. Define the Alarm Trigger:
  • In the Digital Alarm setup, set the trigger tag to AlarmBit. Set Alarm Message:
  • Define the message that will be displayed on the HMI when the alarm is triggered, e.g., “Safety Output Circuit Fault Detected.” Configure Alarm Properties:
  • Set the priority, category, and any acknowledgment settings as needed. By following these steps, you will have a system that monitors for circuit faults on your 5069-OBV8S module and triggers an alarm on the HMI when a fault is detected. This will help in promptly notifying operators and taking corrective actions.