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Key Technical Specifications
| Parameter | Value |
|---|---|
| Catalog number | 2500-C200 |
| Manufacturer | Control Technology Inc. (CTI) |
| Product family | CTI 2500 Series |
| Controller type | Programmable controller and loop controller CPU |
| User program memory | 256K |
| Maximum discrete I/O | 2,048 points |
| Maximum word/analog I/O | 1,024 points |
| Control loops | 64 |
| Alarms | 128 |
| Ethernet port | Built-in; programming and HMI communications |
| USB port | Built-in; programming |
| Profibus interface | Profibus-DP master capability |
| Remote I/O interface | RS485 |
| Memory expansion | Model-dependent; verify installed option |
| Programming platforms | CTI PLC Workshop / SuperSuite; compatibility with Siemens 505 applications |
| Typical replacement targets | Siemens 545-1101, 545-1102, 545-1104, and 545-1106 |
| Mounting/application | CTI 2500 Series or compatible Simatic 505 control system |
| Product status | Legacy product; verify current OEM support and availability |
The published 2500-C200 specification lists 256K user memory, 2,048 digital I/O, 1,024 analog or word I/O, 64 loops, and 128 alarms. CTI also identifies built-in Ethernet, USB, Profibus-DP, and RS485 interfaces for this controller family.
Product Introduction
The CTI 2500-C200 is a programmable controller CPU for CTI 2500 Series and compatible Siemens Simatic 505 control systems. It executes discrete, analog, loop, mathematical, and high-speed sequential control programs while supporting up to 256K user memory, 2,048 digital I/O points, and 1,024 analog or word I/O points.
This CPU is selected for legacy PLC upgrades and replacement work because it can replace several Siemens 505 CPU models without rewiring in specified applications. Confirm the installed memory expansion, firmware, chassis type, communication options, and project compatibility before commissioning.
2500-C200
2500-C200
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| CPU does not power up | Missing rack power, poor seating, blown fuse, or failed CPU | ✅ High | Measure the rack supply at the specified backplane terminals and inspect power-supply status indicators | Check the rack supply and backplane before replacing the CPU |
| Controller remains in STOP | Program fault, configuration mismatch, or CPU hardware fault | ✅ High | Connect with the applicable CTI or Simatic 505 programming software and read the diagnostic buffer | Save the fault log and verify the project before ordering hardware |
| Program will not load | Software-version mismatch, memory limitation, or communication-port issue | ✅ Medium | Test the programming connection through Ethernet or USB and compare project size with available memory | Confirm software compatibility and memory requirements |
| Ethernet programming connection fails | Incorrect IP address, subnet, cable, or port configuration | ❌ Low to ✅ Medium | Check link LEDs, ping the assigned IP address, and verify the programming-port settings | Correct network settings before replacing the CPU |
| HMI cannot communicate | Wrong protocol, address, driver, or Ethernet configuration | ❌ Low | Test the HMI connection independently and compare its driver settings with the CPU configuration | Treat this as a communications-configuration issue first |
| Profibus-DP network is offline | Incorrect master configuration, baud setting, node address, or termination | ✅ Medium | Inspect Profibus diagnostics and check the physical termination at both network ends | Verify the project hardware configuration and field wiring |
| RS485 remote I/O drops out | Shielding, polarity, termination, duplicate address, or cable fault | ❌ Low to ✅ Medium | Check RS485 A/B polarity, shield continuity, node addresses, and termination resistance | Repair the network installation before replacing the CPU |
| Analog values are incorrect | Wrong I/O module type, scaling, wiring, or loop power | ❌ Low | Measure the field signal directly, such as 4–20 mA or 0–10 V, at the I/O terminals | Check the analog module and scaling configuration first |
| Digital I/O is unresponsive | Failed I/O module, missing field supply, blown fuse, or program logic | ❌ Low | Check module status LEDs and measure the field voltage at the I/O terminals | Replace the CPU only if diagnostics identify a CPU or backplane fault |
| Retentive data is lost | Battery, memory option, power interruption, or incompatible replacement | ✅ Medium | Check battery or retention status and compare the installed memory hardware | Back up the program and retentive data before replacing the controller |
| CPU faults after replacement | Firmware, chassis, memory, or project incompatibility | ✅ High | Compare the old and new CPU labels, firmware revisions, options, and configuration | Do not assume the same catalog number guarantees compatibility |
| Controller resets during operation | Power-supply sag, electrical noise, watchdog timeout, or hardware fault | ✅ Medium | Monitor rack voltage during machine operation and review reset/watchdog diagnostics | Correct power and grounding issues before condemning the CPU |
The CPU is often blamed when the actual failure is a rack power supply, memory-retention issue, communication setting, or I/O module. Contact technical support with the CPU nameplate, firmware information, chassis model, diagnostic buffer, project version, and photos of the rack wiring if the fault remains unresolved.
Frequently Asked Questions (FAQ)
What is the CTI 2500-C200?
The 2500-C200 is a CTI 2500 Series CPU that combines PLC functions with process-control capabilities. It supports discrete and analog control, PID loops, alarms, mathematical operations, and sequential logic.
How much memory does the 2500-C200 have?
The standard published specification is 256K of user program memory. Verify whether the installed unit includes a memory expansion option, because the expansion configuration can affect replacement compatibility.
Can it replace a Siemens Simatic 505 CPU?
CTI lists the 2500- as a replacement for Siemens 545-1101, 545-1102, 545-1104, and 545-1106 in specified applications without rewiring. Confirm the exact original CPU, firmware, memory expansion, I/O architecture, and application software before making the swap.
Does the 2500- support Ethernet and Profibus-DP?
The published product information identifies built-in Ethernet for programming and HMI communications, USB programming, Profibus-DP master capability, and an RS485 remote-I/O interface. The exact available functions can depend on the controller revision and installed firmware.
Is the 2500- obsolete?
It is a legacy controller, and marketplace availability is limited. Some suppliers list used or refurbished units, while OEM documentation and support availability can vary. Confirm condition, firmware revision, testing, warranty, and return terms before purchase.
Will my existing PLC program transfer directly?
Not automatically in every installation. The program language and project architecture may be compatible, but you still need to verify firmware, memory size, I/O assignments, communication settings, retentive data, and any Siemens 505-specific instructions. Back up the running controller before removing it.
Why is a surplus or refurbished unit cheaper than a factory replacement?
The lower price generally reflects legacy status, surplus inventory, used condition, or refurbishment. Ask whether the unit is factory sealed, new surplus, used, or refurbished and tested. Request a power-up test report, firmware record, serial-number photographs, warranty period, and confirmation that the Ethernet, USB, and fieldbus interfaces were checked.
