Samsung NX700 / OEMAX PLC — programming & fault fixing with WinGPC

Samsung PLC is what Vietnamese technicians usually call the PLC line built by OEMAX (South Korea) — very common in Korean-invested plants. The same hardware line has carried up to 4 names across owners: OEMAX → Samsung → Rockwell Samsung Automation (RSA) → RS Automation. The main series is NX7 / NX70 / NX700 (modular). When the PLC faults or its program needs editing, technicians get stuck — unsure of the brand and which software to use.

Identify it: one PLC line, four names

1. OEMAX — the original South Korean maker (NX7 / NX70 / NX700 series).
2. Samsung PLC — from the Samsung-group era; this is the label seen most on the floor.
3. Rockwell Samsung Automation (RSA) — the Rockwell joint-venture period.
4. RS Automation — the current name (an independent Korean company) still continuing the NX line.
5. Hardware tells — modular NX700 racks, I/O modules, DeviceNet (NXIO-DNA), NX-MWLINK comm.

Connecting & programming with WinGPC

1. Identify the model Note NX7/NX70/NX700 + the modules on the rack; this drives the right software and cable choice.
2. Software: WinGPC / GPC Editor OEMAX/RS Automation's programming tool — rare and hard to find. You need the version that supports your NX series.
3. Cable & port Connect via the CPU's programming port (serial/loader); use the correct cable and a stable USB-serial adapter.
4. Back up the program FIRST Before changing anything, upload and save the program + parameters to a file — in case there is no original source.
5. Communication If using DeviceNet (NXIO-DNA) or NX-MWLINK: check address, baud and terminator so I/O and remote stations come up.

Common faults

1. CPU in Stop/Error — parameter fault, dead memory battery, or a faulty/loose rack module.
2. Lost program / no source — the old OEM never handed it over; upload from the CPU while it is still readable.
3. Can't connect with WinGPC — wrong software version, wrong cable/COM port, or USB-serial driver on modern Windows.
4. I/O comm dropped — DeviceNet/NX-MWLINK down: duplicate address, wrong baud, missing terminator, noise.
5. Failed I/O module — dead inputs/outputs; needs a (rare) spare or a salvaged module.

When to call an expert

OEMAX/Samsung NX is orphaned gear: few in Vietnam still know it, WinGPC is hard to find, docs are scattered. DeepDebug helps identify the exact line, get the right software version, upload–back up–clone the program and localize faults remotely — including advising a replacement path when parts run out.