Recurring communication faults slow production, create nuisance alarms, and frustrate maintenance teams. They appear, disappear, and reappear, often without a clear pattern.
The good news: most comms faults come from simple, predictable issues that can be identified quickly with routine checks. With the right visibility into the OT environment, maintenance teams can stop nuisance faults before they interrupt production again.
Below are fast, practical health checks that resolve the majority of recurring communication issues E Tech Group finds during site assessments.
1. Start at the Physical Layer: Cable Quality & Terminations
The simplest checks solve the largest number of problems.
Look for:
- Loose terminals
- Aging or improperly crimped connectors
- Bent pins
- Cracked or overstressed Ethernet cables
- Wrong cable category or shielding
Heat, vibration, and cable strain create intermittent faults that only appear under load. A five‑minute cable inspection often prevents hours of troubleshooting.
2. Check Network Switch Health—Especially Unmanaged Switches
Unmanaged switches are common in older facilities but provide no visibility into port errors, bandwidth issues, or degraded components.
Over time:
- Capacitors weaken
- Internal ports deteriorate
- LEDs fail
- Power supplies sag
Random device dropouts or slow responses often trace back to a switch nearing end of life, even if it appears to be operating normally.
Replacing a 10–15‑year‑old unmanaged switch is one of the fastest stability improvements a plant can make.
3. Scan for IP Conflicts or Misconfigured Devices
Duplicate IP addresses create faults that look like ghosts:
- Devices appear online
- Then drop
- Then return
As more smart devices enter OT networks, sensors, scanners, HMIs- unintentional address overlap becomes increasingly common.
A simple network scan can reveal conflicts immediately.
4. Inspect Power Supplies Feeding Communication Hardware
A sagging 24V supply can cause:
- Switch reboots
- Gateway resets
- Intermittent device disconnects
Because symptoms present downstream, power issues often get overlooked. A quick multimeter check can prevent recurring outages.
5. Verify Firmware Levels
Outdated firmware introduces:
- Protocol incompatibilities
- Unstable communication
- Features that don’t behave consistently
Bringing devices up to supported firmware versions stabilizes systems without requiring hardware replacements.
6. Evaluate Electrical Noise in High‑EMI Areas
Manufacturing environments are electrically noisy. Common EMI sources include:
- VFDs
- Welders
- High‑power motors
- Unshielded conductors
Noise can corrupt signals on improperly grounded or unshielded cables. Improved grounding, shield terminations, and routing significantly reduce these faults.
7. Identify Aging Network Devices Ready for Replacement
Switches, gateways, and wireless bridges have practical lifespans. After 10–15 years, intermittent failures become more common and harder to diagnose.
Recurring comms faults are often the early warning that a device is aging out, not a sign of a deeper system issue.
As the first CSIA Enterprise‑certified systems integrator, E Tech Group provides consistent network assessment methods across every plant, giving maintenance teams clear priorities, documentation, and a repeatable approach for long‑term reliability.
Conclusion: Quick Checks Prevent Long Shutdowns
Recurring communication faults are not random; they’re indicators of hidden reliability issues.
With complete OT visibility, maintenance teams can identify aging components, stabilize communication networks, and build a phased modernization plan that aligns with maintenance windows and production constraints.
E Tech Group supports maintenance and reliability teams with:
- Fast, low‑disruption OT health assessments
- Immediate stabilization opportunities
- A prioritized roadmap for network modernization and standardization
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