What you're actually replacing
The 550 came as keypad (2711-K5A), keypad-and-touch (-B5A) and touch (-T5A) variants — and, more importantly, in a spread of communication options: DH-485, DH+, Remote I/O, RS-232, DeviceNet. The display is replaceable; the comms variant is the trap. Whatever you migrate to must either speak to the existing SLC-500 / PLC-5-era controller or wait for the controller's own migration. Read the full catalog string off the rear label before pricing anything.
The four paths
| Path | Time | Honest catch |
|---|---|---|
| Used / refurb 550 | Days | No software work — but same 20+ year age, scarcity pricing, and any future change still needs unobtainable PanelBuilder32 |
| Repair your unit | 1–2 weeks | Backlight, keypad and power sections are routinely rebuilt ($300–$1,000). Buys years, changes nothing about the dead end |
| Migrate to PanelView Plus 7 | Weeks | Rockwell's official path (migration guide 2711P-AP006): 550 variants map to the 6″ Plus 7 class with adapter plates for the cutout. .pba projects do not convert — displays are rebuilt in FactoryTalk View ME. And the Plus 7 is EtherNet/IP-first: a DH+ or Remote I/O 550 needs a comms bridge, or the panel migration waits for the PLC migration |
| Migrate to PanelView 800 | Weeks | Cheaper hardware, free CCW software, DH-485 available for MicroLogix / SLC 5/03 systems — same rebuild-by-hand story, and no DH+ / Remote I/O |
The sequencing advice nobody gives
If the controller behind the 550 is itself a legacy SLC or PLC-5, don't migrate the panel twice. Bridge the outage now (used unit or repair), and plan one coordinated migration — controller and panel together — on your schedule. A panel rebuilt today against SLC addressing gets rebuilt again when the controller goes Logix.
Honest limitation: if your controller only speaks DH-485 or DH+, a phone can't reach it directly either — the bridge options below apply to Ethernet-capable controllers (SLC 5/05, MicroLogix 1100/1400, any Logix). Where your 550 hangs off an Ethernet-capable PLC, the phone screen works today.
Keep producing while you wait
Have the FactoryTalk project export? Drop it into our free HMI project converter — it runs in your browser, the file never leaves your PC, and every display becomes a page of buttons, indicators and values for the app, with the real tag names already in place.
Today, from a phone: the free LineKeeper app for iPhone and iPad connects to your ControlLogix or CompactLogix over EtherNet/IP and reads the controller's own tag list — no export files, no configuration. Build a dashboard and an operator panel with start/stop buttons in about 15 minutes, mount a spare iPad in full-screen panel mode, and the operator has a screen before the first repair quote arrives. Reading is free; writes are a one-time unlock with confirmation and limit checks on every value.



The 15-minute temporary panel
Zero-config tag browser for Logix, drag-and-drop dashboard, operator panel, alarms — no changes to the PLC program.
On a desktop? Scan with your iPhone or iPad to get the free app.For the machine itself: the LineKeeper device — in development — is a self-contained 7″ or 10″ touchscreen built to live on the machine permanently — the same drag-and-drop screens, plus what a phone shouldn't carry:
- Live view of every tag, refreshed twice a second — plus write access with a full audit log
- Operator panel: start/stop, indicators, setpoints — hold-to-run buttons release safely
- Stays useful after the repair: data logging, dashboards, machine diagnostics
Small hardware that helps while the panel is out
- GL.iNet Opal travel router — Wi-Fi into the machine network from a spare switch port, so the phone app can stand in as the screen today.
- Anker USB-C to gigabit Ethernet adapter — wired straight into a spare switch port, the phone sees the controller in seconds; USB-C iPhones and iPads need no drivers.
- VIVO pole-mount VESA arm — puts the temporary screen at eye level on a machine post instead of a chair.
- TICONN IP67 enclosure with clear cover — houses the gateway or Wi-Fi bridge on the machine without bare boards on the rail.
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