- Why No Official Pass Rate Exists
- What Verified Data Actually Exists
- How the C-359 Is Delivered
- Where Candidates Lose Points: The Nine Topics
- Silver vs. Gold: Two Different Hurdles
- Availability and Registration Caveats
- How to Read Pass-Rate Claims You Find Online
- Sequencing Your Preparation by Domain
- Frequently Asked Questions
- SACA has not published a verified pass rate for Programmable Controller Systems 3 (C-359); any specific percentage you see online is unsupported.
- The written Silver exam is proctored online through the SACA portal; Gold adds an observed hands-on assessment on approved equipment.
- Nine published preparation topics run from distributed I/O via Ethernet to data conversion instructions, with no published weights.
- Exact question count, time limit, universal pass mark and retake rules were not verified, so confirm them with SACA directly.
Why No Official Pass Rate Exists
Search for a C-359 pass rate and you will find confident-sounding numbers on forums, aggregator sites and course landing pages. Treat them with suspicion. For Programmable Controller Systems 3 (C-359), issued under the Smart Automation Certification Alliance (SACA), the research behind this article found no issuer-published pass rate, no published cohort statistics and no independent psychometric report.
That absence is itself the most important data point. Many industry micro-credentials are delivered through member schools and employers rather than sold to the general public, and their issuers often do not publish outcome statistics. If a site quotes you a precise figure such as "78% first-time pass rate" without citing a SACA document, the number was almost certainly invented to make a page rank.
What Verified Data Actually Exists
Although outcome statistics are missing, several facts about the credential are documented. Here is what can and cannot be confirmed as of the October 2026 research check.
| Item | Status |
|---|---|
| Issuer | Smart Automation Certification Alliance (SACA) - confirmed |
| Published preparation topics | Nine topics, corroborated by the O*NET exact-credential record |
| Delivery of written exam | Proctored online via the SACA portal (Silver level) |
| Hands-on component | Gold level requires Silver plus an observed assessment on approved equipment |
| Pass rate | Not published |
| Universal pass mark | Not verified |
| Question count and time limit | Not verified |
| Individual retail exam fee | Not published; access runs through membership benefits |
| Retake and renewal rules | Not verified |
The pattern is clear: structure and content are documented, while outcome and policy details are not. If you are budgeting, our breakdown of C-359 certification cost explains how membership-based access changes the usual pricing conversation.
How the C-359 Is Delivered
Understanding the delivery model helps explain why a single "pass rate" would be a misleading number even if one existed.
The Silver written exam
The written component is a proctored online exam taken through the SACA portal. Because it is remote and proctored, candidates need a stable connection, a compliant testing environment and familiarity with the portal workflow before exam day. Portal registration help exists on the SACA portal, and it is worth reading before you schedule anything.
The Gold hands-on layer
Gold requires Silver plus an observed hands-on assessment on approved equipment. Any pass statistic would therefore have to specify which level it describes. A number that blends written-only candidates with hands-on candidates tells you nothing useful about your own odds.
Who actually sits the exam
Certification access is extended to eligible member-institution students and member-company employees through membership benefits. This means the candidate pool is largely people already enrolled in structured automation coursework or employed by participating companies. A pool preselected for instruction behaves very differently from an open-enrollment pool, so comparisons with consumer-facing certifications are unreliable. For eligibility specifics, see C-359 requirements.
Where Candidates Lose Points: The Nine Topics
With no pass-rate data, the best predictor of your result is how well you command the published preparation topics. SACA does not publish weights for these nine topics, and the count of nine is simply the number of supplied topics rather than an official domain structure. That means you cannot safely skip any of them on the assumption that it is lightly tested. The full breakdown lives in our C-359 exam domains guide; here is a failure-risk view.
Domains 1, 2 and 3: Distributed I/O via Ethernet, Serial Data Communications, Modbus
The communications cluster rewards candidates who can reason about how data actually moves between devices, not just recite definitions.
- Know how remote I/O racks and drops exchange data with a controller over Ethernet.
- Distinguish serial communication parameters and their effect on a link working or failing.
- Understand Modbus addressing, function-style data access and how register or coil references map to controller memory.
Domain 4: Statement List Programming Language
Statement List is text-based and reads very differently from ladder logic. Candidates who have only worked graphically often struggle to interpret instruction sequences quickly.
- Practice reading short Statement List routines and predicting the output.
- Be comfortable translating between ladder intent and list-style instructions.
Domain 5: PLC-to-PLC Data Communications via Ethernet/IP
This topic is explicitly about programming and interpreting these exchanges, so expect to analyze configurations and message setups rather than just name the protocol.
- Trace which controller produces data and which consumes it.
- Interpret what a given configuration will do and where a link would break.
Domains 6 to 9: PID Instructions, Data Arrays, String Data, Data Conversion Instructions
This group tests data-handling precision. Small mistakes in indexing, string length or conversion type produce wrong answers.
- PID: understand what each tuning term does to a controlled process and how loop parameters are set.
- Arrays: indexing, bounds and looping through elements.
- Strings: how text is stored, compared and manipulated in controller memory.
- Conversion: moving values between data types without losing range or meaning.
Silver vs. Gold: Two Different Hurdles
Because Gold stacks a hands-on assessment on top of Silver, the two levels fail candidates for different reasons.
| Factor | Silver (written) | Gold (written plus hands-on) |
|---|---|---|
| Format | Proctored online written exam via SACA portal | Silver plus observed assessment on approved equipment |
| Main risk | Gaps across the nine topics; portal or proctoring logistics | Translating knowledge into working configurations under observation |
| Best preparation | Concept recall and program interpretation | Time on real or simulated approved hardware |
| Outcome data | Not published | Not published |
A candidate who is comfortable reading about Modbus but has never configured a device on real equipment may clear Silver and stumble at Gold. Hands-on hours matter most for the second hurdle, and course hours or hands-on assessment time should not be confused with written-exam timing.
Availability and Registration Caveats
Before you worry about passing, confirm you can sit the exam at all. A supplier listing for SACA micro-credentials marks C-359 with an asterisk keyed to "In Development." That listing is a vendor catalog, not an authoritative SACA release notice, so it should not be read as proof the exam is or is not currently available. What it does justify is caution: contact SACA or the relevant testing center to confirm current assessment availability before planning around a booking.
Key Takeaway
Verify availability first, then prepare. Ask your institution or employer's SACA contact whether the C-359 assessment is currently offered and which delivery path applies to you. Scheduling details are covered in C-359 exam dates.
Prerequisite sequencing, not eligibility rules
A 2024 HI-TEC presentation from SACA, CESMII, Amatrol and UW-Stout places C-309 before C-359 and C-359 before C-360 in an example degree pathway. These are curriculum prerequisites within a sample pathway, not issuer-wide eligibility requirements. Likewise, UW-Stout lists C-359 for 3 credits within its specific articulation agreement with Northwood Technical College, which does not imply a universal college-credit award.
How to Read Pass-Rate Claims You Find Online
You will encounter pass-rate numbers anyway. Here is a quick filter for deciding whether to believe them.
- Look for a named source. A legitimate statistic cites SACA, an institution or a dated report. "Industry sources say" is not a citation.
- Check which level it describes. Silver, Gold or an unspecified blend produce very different numbers.
- Check the credential name. The label "C-359" is shared by unrelated credentials from other bodies. A statistic about a different certification says nothing about Programmable Controller Systems 3. If a page mixes in fees, dates or salary figures that do not match SACA's model of membership-based access, it is likely describing something else entirely.
- Beware suspiciously precise figures. Exact percentages without a methodology are a hallmark of fabricated content.
- Notice what is missing. If the same page cannot tell you the question count or time limit, it does not have genuine exam-level data.
If you are still deciding whether the credential justifies the effort, our C-359 ROI analysis and salary guide apply the same evidence-first approach. For background on the credential itself, start with what C-359 certification is.
Sequencing Your Preparation by Domain
With no pass-rate benchmark to calibrate against, the sensible move is to prepare for breadth and verify weak spots with practice questions. This is the one scheduling section in this article, and it is keyed to the nine topics rather than to generic advice. Adjust to your own course timeline.
Communications foundations
- Distributed I/O via Ethernet and serial data communications first, because later protocol topics build on them.
- Sketch a simple network diagram for each and label what data moves where.
Protocols and controller-to-controller exchange
- Modbus communication protocol, then PLC-to-PLC data communications via Ethernet/IP.
- Interpret example configurations rather than only memorizing terms.
Statement List and data handling
- Statement List programming language, then data arrays, string data and data conversion instructions.
- Read and trace short routines daily; these topics reward repetition.
PID and full-scope review
- PID instructions, then a mixed review across all nine topics.
- If pursuing Gold, schedule hands-on time on approved equipment.
For a broader plan, see the C-359 study guide, and keep the C-359 cheat sheet handy for final review. When you are ready to test yourself against realistic questions, use the C-359 practice tests to find which of the nine topics needs more time. You can also explore structured C-359 training options.
Frequently Asked Questions
No verified pass rate has been published for Programmable Controller Systems 3 (C-359). SACA has not released cohort outcome statistics, so any specific percentage you see online lacks a traceable source. Focus on mastering the nine published topics instead.
Difficulty depends on your background. The topics span Ethernet and serial communications, Modbus, Statement List, Ethernet/IP, PID, arrays, strings and data conversion, so breadth is the main challenge. Candidates comfortable with ladder logic but new to text-based programming or networking tend to need extra time. See our difficulty guide for detail.
The written Silver exam is proctored online through the SACA portal. Gold requires Silver plus an observed hands-on assessment on approved equipment. The exact question count, time limit and universal pass mark were not verified, so confirm them with SACA.
No published individual retail exam price was found. Certification access is described as a membership benefit for eligible member-institution students and member-company employees. Ask your school or employer, or contact SACA, about how access works in your situation.
Uncertain. A supplier catalog marks C-359 as "In Development," though that listing is not an authoritative SACA notice. Confirm current assessment availability with SACA or the testing center before making any plans or purchases.
Because the evidence on outcomes is thin, the most honest summary is also the most useful one: there is no reliable C-359 pass rate to anchor on, so your best protection is comprehensive coverage of all nine topics, confirmed availability and, if you are aiming for Gold, real hands-on practice.