Product Overview

The Allen-Bradley 1785K-PMPP-1700​ (Catalog No. 1785-K-PMPP-1700) is a legacy yet highly reliable industrial operator interface terminal, part of Rockwell Automation’s Programmable Man-Machine Interface (PMxx/PM-PP) product family, purpose-built to provide local visualization, monitoring, and control for Allen-Bledley PLC-5, SLC 500, and certain ControlLogix systems via Data Highway Plus (DH+), Remote I/O (RIO), or serial links. Designed for continuous-process and discrete-manufacturing environments where plant-floor operators require direct interaction with control logic without accessing the programming terminal, the 1785K-PMPP-1700​ features a large 17-inch high-resolution color CRT/LCD display with a tactile function-key membrane overlay, allowing customizable screen navigation, alarm acknowledgment, setpoint adjustment, and status indication.As a dedicated HMI companion to the Allen-Bradley PLC-5 platform, the 1785K-PMPP-1700​ runs application screens developed in Rockwell Software’s PM/PM-PP configuration tools and downloads project files directly from the host PLC or via a programming PC. The unit supports multiple screen pages, dynamic data display, bitmap graphics, and user-defined soft keys, making it suitable for both simple pushbutton-replacement applications and sophisticated multi-page process visualization. Its rugged NEMA-rated enclosure, wide operating temperature range, and long-life backlight are engineered for demanding industrial conditions including oil & gas, power generation, pulp & paper, metals, and batch-processing plants.Many legacy process facilities continue to rely on the 1785K-PMPP-1700​ due to its proven stability, straightforward DH+ integration with PLC-5 processors (such as the 1785-L40B, L60B, L80B series), and the low total cost of ownership compared with retrofitting an entire HMI/SCADA layer. When specified as a spare or replacement, the 1785K-PMPP-1700​ ensures minimal downtime in existing installed-base systems that have not yet been migrated to modern PanelView Plus platforms.

Technical Specifications

Product Model | 1785K-PMPP-1700​ (1785-K-PMPP-1700)Manufacturer | Rockwell Automation / Allen-BradleyProduct Type | Industrial Operator Interface Terminal / PM-PP Color HMIDisplay Size | 17 inch Color CRT or TFT LCD (model-dependent, legacy series)Resolution | Typically 640 × 480 (VGA) or 800 × 600 depending on revisionCommunication Interface | Allen-Bradley Data Highway Plus (DH+), Remote I/O (RIO), RS-232 (DF1/ASCII)Function Keys | Programmable membrane function / navigation keys (soft keys + numeric)Power Supply | 100–240 V AC, 50/60 Hz (typical), or 24 V DC on certain variantsOperating Temperature | 0 °C to +50 °C (32 °F to 122 °F)Storage Temperature | -20 °C to +70 °CHumidity | 5% to 95% RH, non-condensingEnclosure Rating | NEMA 12 / IP54 (front bezel), UL / cUL listedMounting | Panel mount (cutout per Rockwell dimensional drawing)Certifications | CE, UL 508, CSA

Main Features and Advantages

Highly compatible with legacy PLC-5 architecture: The 1785K-PMPP-1700​ communicates natively over Allen-Bradley Data Highway Plus (DH+) at 57.6 kbps or 230.4 kbps, as well as Remote I/O scanner mode, enabling seamless tag/register read/write with PLC-5 processors (1785-L40B, -L60B, -L80B etc.) without additional gateway hardware or protocol converters. This direct bus integration significantly reduces system complexity and commissioning time in brownfield installations.Large-format color human-machine interface: With its 17-inch color display, the 1785K-PMPP-1700​ presents process graphics, trend indicators, alarm banners, and animated icons far more effectively than small-character monochrome HMIs. Operators can navigate through dozens of configurable screen pages using dedicated soft keys, numeric entry pads, and cursor controls, improving situational awareness and reducing operator error during abnormal situations.Robust industrial design for harsh environments: Engineered with a NEMA 12 / IP54 front faceplate, the 1785K-PMPP-1700​ resists dust, oil mist, and accidental splashing common in steel mills, paper machines, and chemical blending areas. The sealed tactile keypad withstands millions of actuations, and the internal power supply accommodates wide AC input variation typical of older plant power distributions.Offline configuration and easy project download: Application screens for the 1781785K-PMPP-1700​ are created using Rockwell’s PM/PM-PP development software and downloaded via DH+ or RS-232. Screen objects—including numeric displays, bar graphs, bit lamps, pushbuttons, and multi-language text—can be modified offline and redeployed without disturbing the underlying PLC logic, facilitating rapid maintenance and localized customization.Cost-effective life-cycle extension: For facilities operating Allen-Bradley PLC-5-based control systems that are not yet scheduled for full DCS/Logix migration, deploying or replacing with the 1785K-PMPP-1700​ extends the useful life of the existing control infrastructure at a fraction of the cost of a complete HMI overhaul, while maintaining familiarity for long-tenured operators.