Email: jiedong@sxrszdh.com
Phone / Wechat：+86 15340683922Description
Product Introduction
The DS3800NMEC is a node master expansion controller board for Mark IV systems—the “N” in the suffix indicates node, the “M” indicates master, the “E” indicates expansion, and the “C” indicates controller. This board provides expansion control and signal distribution for node master applications in turbine control systems. It was used in installations where node master expansion control was needed to extend the control system.
The board plugs into the Mark IV backplane and provides a node master expansion controller interface. Compare this to the DS3800NMEA (node master expansion adapter) or the DS3800NLCA (local communications adapter). The NMEC is specifically for node master expansion controller applications where control signal distribution is needed.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Interface Type | Node master expansion controller |
| Controller Interface | Mark IV node master expansion |
| Backplane Interface | Parallel, Mark IV-specific |
| Diagnostic LEDs | Power, Link Status, Fault |
| CPU Compatibility | DS3800DMP series (Mark IV) |
| Backplane Current Draw | +5V DC @ 0.8A, +12V DC @ 0.3A |
| Operating Temperature | 0 to 60°C (non-condensing) |
| Dimensions | 328 mm x 185 mm x 20 mm (full-length Mark IV) |
| Mounting | Standard Mark IV rack slot |
| Configuration | No DIP switches—hardware address fixed |
Compatible Replacement Models
| Model | Compatibility Level | Notes |
|---|---|---|
| DS3800NMEC1 | ✅ Drop-in Replacement | NMEC with minor revision. Same functionality. |
| DS3800NMEA | ✅ Drop-in Replacement | Similar node master expansion adapter—check configuration. |
| DS3800NLCA | ✅ Drop-in Replacement | Similar local communications adapter—check configuration. |
| DS3800NIOA | ❌ Functionally Incompatible | Standard I/O board—different function. |
| DS3800NECA | ❌ Functionally Incompatible | Ethernet board—different function. |
Frequently Asked Questions (FAQ)
What does the NMEC board do?
The NMEC is a node master expansion controller board for Mark IV systems. It provides expansion control and signal distribution for node master applications.
What’s the difference between the NMEC and the NMEA?
The NMEC is a controller—it provides expansion control and signal distribution. The NMEA is an expansion adapter—it provides expansion connectivity. The NMEC is for control applications; the NMEA is for connectivity.
Can I hot-swap this board?
No. Mark IV backplanes are not hot-swappable. Power down the cabinet, lock out the breaker, and wait 60 seconds before removing or installing the board.
What’s the most common failure mode on the NMEC?
We’ve serviced about a dozen NMEC boards. The most common failure is the controller circuitry—it can degrade over time, causing control signal issues. The second most common failure is the edge connector—corrosion from humidity. The board is repairable.
What’s your warranty and lead time?
We stock the NMEC in limited quantities. Lead time is 1-2 business days. We offer a 1-year warranty. We test every board with a 24-hour burn-in and a diagnostic verification. The test report is included.
Is this board compatible with the Mark VIe?
No. This board is for Mark IV systems only. The backplane architecture is different.
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Email: sales@plcfcs.com- Phone：+86 15343416922
- Wechat：+86 15343416922
Wechat：+86 15343416922PLC : Allen Bradley , Siemens MOORE, GE FANUC , Schneider
DCS : ABB ,Honeywell, Invensys Triconex , Foxboro , Ovation,YOKOGAWA, Woodword, HIMA
TSI : Triconex , HIMA , Bently Nevada , ICS Triplex
Complete service we offer
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