Key Technical Specifications
| Item | Specification |
|---|---|
| Model | A6824 (6TE); A6824-R (4TE, different chassis) |
| Common Part Number | 9199-00090 |
| Manufacturer | Emerson (USA origin) |
| Product Type | ModBus and Rack Interface Module |
| Compatible System | AMS 6500 / A6000 machine monitoring, API 670 compliance |
| Rack Format | 3U, 1-slot, 6TE width for IMR6000 19-inch rack (A6824); A6824-R is 4TE for IMR6500 |
| Communication Protocols | ModBus TCP/IP (RJ45, 10Base-T) and ModBus RTU (serial) |
| ModBus RTU Settings | 19.2 kbaud, 8 data bits, even parity, 1 stop bit |
| RS485 Bus Lines | 6 lines, up to 8 A6000 displays per line |
| Default IP | 192.168.255.1 / 255.255.255.0 (verify before connecting to live network) |
| Operating Temperature | 0 to 65°C (32 to 149°F) |
| Storage Temperature | -30 to 85°C (-22 to 185°F) |
| Humidity | 5 to 95% non-condensing |
| Hot-Swap | API 670-compliant hot-swappable module |
Product Introduction
The A6824 is the module that makes an AMS 6500 rack actually talk to the outside world. Without it, you have perfectly good vibration and machinery protection data trapped inside the rack. With it, speed, 1x/2x vibration, gap values, alarm states, and channel health flow out over ModBus to your DCS, historian, or condition-monitoring server.Engineers keep this one on the shelf because it is a communication choke point. The module is hot-swappable and API 670-compliant, which matters when a turbine trip history depends on getting alarm data out of the rack before someone yanks the wrong card. The 6TE A6824 fits IMR6000 racks; the narrower A6824-R fits IMR6500. They are not mechanically interchangeable, even though the function looks similar.
Quality SOP & Tech Pitfalls
The Lab Report (SOP):
We start with a visual check: Emerson label, part number 9199-00090 or equivalent, RJ45 and RS485 connector condition, PCB cleanliness, and rack-handle integrity. Power is applied on a bench supply to confirm the green “Power OK” LED and basic self-test behavior. If an AMS 6500 test rack is available, we verify ModBus RTU/TCP link activity and confirm the module responds on the expected address. The default IP 192.168.255.1 is logged but not left active on a customer network. Firmware or configuration revision is recorded. Final packing is anti-static with nameplate photos.The Engineer’s Warning (Pitfalls):
The most common mistake I see is ordering “A6824” and receiving an A6824-R. The R version is 4TE wide and designed for IMR6500 racks; the standard A6824 is 6TE for IMR6000. It will not seat properly in the wrong chassis. The second trap is the default IP address. If you power this module up on a live plant network without changing 192.168.255.1, you can create an address conflict or route traffic to the wrong subnet. Photograph the existing configuration before removal.
Installation & Configuration Guide
1. Pre-Installation ⚠️
- Confirm rack type: IMR6000 (A6824, 6TE) or IMR6500 (A6824-R, 4TE).
- Photograph the existing module: part number, slot position, ModBus address, IP settings, and RS485 wiring.
- Record the ModBus RTU parameters: baud rate, parity, stop bits, and node address.
2. Removal
- Verify the rack power is stable; the module is hot-swappable, but do not pull adjacent monitor cards at the same time.
- Release the handle and slide the module straight out.
- Inspect the backplane connector for bent pins before inserting the replacement.
3. Installation
- Seat the new A6824 firmly into the correct 19-inch rack slot.
- Reconnect RS485 and Ethernet cables exactly as photographed.
- If replacing with a different revision, verify ModBus address, IP address, and subnet mask before enabling communication.
4. Power-On & Testing
- Confirm the green power LED illuminates.
- Check self-test status and verify no hardware fault alarms appear on local displays.
- Test ModBus RTU polling from the host system; confirm speed, vibration, and alarm tags update.
- For ModBus TCP, verify ping response and register reads from the DCS or AMS workstation.
Compatible Replacement Models
| Replacement Model | Compatibility Tier | Notes |
|---|---|---|
| A6824 (same part number, e.g., 9199-00090) | ✅ Drop-in | Exact match for IMR6000 6TE racks. No configuration change if settings are copied. |
| A6824-R | ⚠️ Chassis Dependent | Same function, but 4TE width for IMR6500 racks. Not a mechanical drop-in for A6824 slots. |
| Newer AMS 6500 interface revisions | ⚠️ Verify First | May require firmware or configuration migration. Confirm with Emerson documentation for your AMS release. |
| Third-party ModBus gateways | ❌ Not Recommended | AMS 6500 rack integration, API 670 behavior, and local display support are not guaranteed. |
Frequently Asked Questions (FAQ)
Q: Is A6824 the same as A6824-R?
No. Both are ModBus and rack interface modules for AMS 6500 / A6000, but A6824 is 6TE for IMR6000 racks and A6824-R is 4TE for IMR6500 racks. They do not fit the same slot.Q: Can I hot-swap this module?
Yes, it is API 670-compliant hot-swappable. That said, I still recommend doing it under a controlled change window. You do not want to lose ModBus data during a transient event.Q: What data does it export?
Speed, vibration (1x, 2x, etc.), gap values, alarm status, channel health, and phase data from AMS 6500 modules. The exact tag list depends on your AMS configuration.Q: Does it support redundant communication?
The module can be configured for ModBus TCP/IP, ModBus RTU, or both paths. True network redundancy depends on your overall AMS 6500 and DCS architecture, not just this card.Q: What is the default IP address?
192.168.255.1 with subnet 255.255.255.0. Change it before connecting to a production network.Q: What warranty do you offer?
12 months. We provide nameplate photos, part number confirmation, and basic functional test records when available.Q: Can this module replace an Ovation or DeltaV communication card?
No. The A6824 is an AMS 6500 / A6000 machine monitoring interface, not an Ovation data-link card or a DeltaV communications module. It talks ModBus to expose machinery protection data; it does not serve as a general DCS controller interface.
