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  1. Advantages of AS-i
  2. System integration and set-up
  3. Troubleshooting guide

AS-i troubleshooting guide

Top 3 causes of AS-i network failures

  1. Check modules for physical damage andverify the green power and I/O LEDs are functioning
  2. Inspect AS-i Network and 24 V power cables for exposed or broken wire
  3. Verify cableconnections are fully seated from I/O devices connected to AS-i modules and screw terminal connections are not loose

Configuration faults

An AS-i network will scan the network for 3 states of each node:

  • Detected - node is present on the network
  • Projected - node has been taught to the AS-i master
  • Active - node has been assigned an address and has been projected

A working AS-i system will have each node detected, active, and projected. If a node fails not to be recognized in any one of these 3 states, then a configuration fault will occur.

Fault diagnosis

Local fault indication at the node may mean:

  • Short circuit on an I/O point
  • Communication problem (yellow cable)
  • Loss of auxiliary power (blackcable)
  • Overload condition

Master diagnostics

The diagnostic LED:

  • Green steady: no fault, no warning
  • Red fast flashing: at least one fault is available
  • Yellow slow flashing: no faults, at least one warning is available

Overview of the AS-i system

Maintaining the SAW system

The Safety at Work system will fail to safe as configured in the safety monitor. The module can then be replaced using the following procedure:

  1. Remove the damaged safety module.
  2. Press the service button on the safety monitor.
  3. Replace the safety module with an identical unit.
  4. Press the service button again.
  5. The safety system should return to normal operation.

What happens if multiple safety nodes fail?

  1. Remove both damaged safety nodes.
  2. Address one node and connect it to the system (without connecting the auxiliary safety devices.)
  3. Press the service button (the Red, Yellow and Green LEDs will scroll when the configuration mode has been entered.)
  4. Address and connect the second node (with all axuiliary safety devices connected and active.)
  5. Press the service button.
  6. Disconnect the first node attached in this process.
  7. Press the service button.
  8. Reconnect the node (with all auxiliary safety devices connected and active.)
  9. Press the service button.

What happens if the safety monitor fails?

  1. Remove the damaged monitor from the panel.
  2. Remove chip card from failed unit.
  3. Apply 24 VDC power to the replacement unit.
  4. Insert chip card into replacement unit.