Choosing between these two industrial components starts with one question: is the missing piece in your control panel a screen or a brain? Both belong to the PLC/HMI world, but they fill opposite roles. The Allen Bradley PanelView Plus 7 Ser B Industrial HMI Touchscreen 2711P-T12W21D8S is a used color touchscreen HMI for operator interaction. The NEW Automation Direct P1-550 Programmable Controller Productivity1000 CPU is a new programmable controller with Ethernet, serial, USB, and a substantial ladder-memory footprint. Picking one means deciding whether you need to see and command your machine or run the logic behind it.
Quick verdict
If you need an operator panel and can accept a used unit, the Allen Bradley PanelView Plus 7 is the pick. Its $799.99 price buys an operator-facing HMI with the Allen-Bradley name. If you need the controller that actually executes your logic, the AutomationDirect P1-550 is the natural choice at $211.65, with the lower end of the price spread and a wide range of communication options.
Comparison table
| Product | Price | Condition | Core role | Standout specs | Relative price |
|---|---|---|---|---|---|
| Allen Bradley PanelView Plus 7 | $799.99 | Used | Operator HMI | Color display, touch interface | |
| AutomationDirect P1-550 | $211.65 | New | Programmable controller CPU | 50 MB ladder memory, Ethernet, RS-232, RS-485, USB, microSD |
Where each product wins
- The Allen Bradley PanelView Plus 7 wins when your priority is operator visibility: a screen for monitoring and commands, with visible wear that matches its used condition.
- The AutomationDirect P1-550 wins when your priority is control processing: the new CPU carries the logic side of the project at the low end of the price pairing.
Product notes
Allen Bradley PanelView Plus 7 Ser B
The PanelView Plus 7 gives you a color touchscreen HMI from the Allen-Bradley panel line, which is the main reason to pick it when your operator interface needs to be the visible center of the control station. The unit is used, though, and the wear is not hidden: the screen shows visible scratches and scuffs, and the bezel carries cosmetic wear. If you can accept that surface condition, the price buys the HMI side of the system. It does not do the work of a controller, so make sure your logic CPU is already in place or planned alongside it. The practical tradeoff is paying for display capability while taking on the used condition as part of the deal.
NEW Automation Direct P1-550
The P1-550 is the opposite kind of component: a programmable controller CPU that brings 50 MB of ladder memory and a useful spread of ports-two Ethernet, one RS-232, one RS-485, and one micro-USB-along with a microSD card slot. For a new build, that combination means the CPU can handle both machine logic and communication without a lot of extra hardware. It is listed as new and sits at the low end of this price pairing. The limitation to keep in mind is power: this CPU requires external 24 VDC, so you need a panel supply to bring it to life. Since it is a CPU rather than an HMI, plan a display separately if operators need to see machine status.
Final choice by use case
Choose the Allen Bradley PanelView Plus 7 when your control panel is missing its operator-facing window: you need an HMI display for monitoring and commands, and you are okay with a used unit that shows scratches and scuffs. Choose the AutomationDirect P1-550 when your panel needs the computer that runs the logic: you want a new CPU and you can provide 24 VDC externally. For a full system, many setups need both-a P1-550 CPU for control and an HMI for visibility. If you have to pick one first, let the missing function decide.
