Beyond the Screen: The Hidden Challenges Inside SCADA Systems

It is difficult for owners and operators to manually control and supervise their utilities simultaneously. SCADA, or supervisory control and data acquisition, is the solution for remotely monitoring, controlling, and collecting data from utility systems. 

Remote access to SCADA systems provides full visibility and control of these vital systems from a single location. This means that any faults or issues can be quickly addressed, preserving utility uptime.  

Currently, many facilities are aging and being “patched” over time. These uncoordinated, reactive fixes are often misdiagnosed as simple software problems when the real issues lie in the outdated, disjointed system hardware or the Programmable Logic Controller (PLC). They serve as piecemeal strategies rather than a cohesive or holistic solution. 

Often, SCADA (or PLC) problems are symptoms of systemic gaps in system infrastructure. 

The Biggest Misconceptions About SCADA Systems 

When system errors are misdiagnosed, the real issue is ignored, resources are incorrectly allocated, all leading to a delay in necessary system upgrades. The real issues get overlooked because software fixes “work” for the short term. However, systems can be near end-of-life even without signs of obvious failure. 

Facilities that “work” but have not been maintained are difficult to repair, as replacement parts can be difficult to source. This is why including PLC (SCADA) maintenance and investigating the true state of facilities should be a top priority for operators. 

It is important to remember that SCADA systems are more than just the software – they are a combination of software, licenses, and hardware working together to create a full facility management system. They all must work in unison to ensure optimal performance and system longevity. 

The Most Overlooked Factor: Operator Experience and HMI Design 

A SCADA system is only as impactful as its outputs. Having full visibility and control of a facility only works when action is taken based on the system's output. A key element of a SCADA system is the HMI, or the Human Machine Interface. This is the visual screen operators use to gain insights and make important decisions based on their facility's current state.  

When asked about the most overlooked part of a SCADA system, Travis Cheek, our SCADA manager, said, “In my experience, it's the HMI design and layout. Ultimately, a SCADA system is only as effective as the human being making decisions based on its output.” 

When HMIs are underutilized and critical decisions are not proactively made to safeguard the efficiency and productivity of a system, it can lead to cognitive overload, slower response, and an increased risk of error down the road. 

Common Challenges in Aging SCADA Systems 

As facilities age and are “patched” with reactive fixes, the real challenges can turn into cost issues over time. The most common challenges facing aging SCADA systems include hardware and obsolescence, patchwork systems and compatibility risk, lack of integration across facilities, and daily silent killers. 

Hardware & Obsolescence

Aging facilities can become difficult and costly to repair. Their outdated components are often difficult to source locally, forcing operators to turn to costly global markets to obtain the components the system requires to remain operational.  

Patchwork Systems & Compatibility Risks

Repeated patchwork fixes to outdated systems that fail to address the underlying issue increase the risk of incompatibility with future systems. The disjointed system will eliminate any automation efficiency that the SCADA systems are made to provide and therefore become obsolete. Additionally, manufacturers often terminate support for legacy products on outdated systems.  

Lack of Integration Across Facilities

Segmented and patched updates leave systems running independently from one another. This means that facility managers and owners must navigate and maintain each system separately from one another, rather than using a united SCADA program. The lack of integration across facilities leads to inefficient operations, costly repairs, and uneven demand distribution. Outdated or fragmented utility systems create missed opportunities for seamless automation across the entire system. 

Daily Silent Killers

Aging SCADA systems might not show any obvious signs of system-wide inefficiencies, but rather “small” issues that manifest in day-to-day operations. These seemingly insignificant issues compound over time, leading to inconsistent system performance. These errors lead to patchwork repairs and reduced visibility into the bigger underlying issue. When properly designed, SCADA systems do not experience day-to-day errors, allowing owners and operators to focus on operational uptime and efficiency. 

How to Evaluate and Improve Your SCADA System 

As operational demands evolve and technology advances, even well-established SCADA environments can develop gaps in performance, security, or scalability. Evaluating your SCADA system is essential to ensuring continuous, safe, and efficient operations. 

The first step is to implement a full system audit. Identify all Programmable Logic Controllers (PLCs), Human-Machine Interfaces (HMIs), Remote Terminal Units (RTUs), and switches. Once identified, evaluate the inputs and outputs of each, the system's performance and capacity, and its communication methods. This in-depth evaluation of all existing hardware will show how the system is currently connected and identify any gaps. 

Next, plan for phased upgrades. Rather than doing a complete system upgrade all at once, a phased approach allows for seamless changes and minimal downtime. Begin with the most critical and foundational issues first, then prioritize and plan out future upgrades accordingly. 

Finally, review the SCADA design - ensure the new design is not overcomplicated; a simple design is an effective one. The use of standardized components allows for seamless integration and a future-proof system. Keep all documentation on hand for easy reference during maintenance checks and minor upgrades. Monitoring your system’s design is what separates a high-performing SCADA system from the rest.  

Don’t Wait for Failure 

Proactive maintenance of utility systems extends their lifespans, enabling optimal performance and continued operations. Aging systems increase the risk of downtime and failure. Remember, SCADA issues can often be hidden, but effective monitoring and evaluation can highlight threats before failures occur.  

Guzman Engineering provides SCADA programming solutions that keep facilities safe, compliant, and efficient. Partner with us today to take back control of your facility.