Allen-Bradley 1747-PIC SLC 500 Personal Computer RS-232 to DH-485 Interface

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Allen-Bradley 1747-PIC interface converter for SLC 500 PLC systems, used to connect a PC serial port to a DH-485 communication port on legacy SLC 5/01–5/03 controllers.
Good used condition with attached ribbon cable and visible wiring diagram label; ideal for maintaining older SLC 500 installations.

Item details

• Brand: Allen-Bradley (Rockwell Automation)

• Series: SLC 500

• Catalog number: 1747-PIC

• Type: Personal computer interface converter / RS-232 to DH-485 interface

• Function: Bridges a PC’s RS-232 serial port to an SLC 500 processor’s DH-485 communication port for programming and diagnostics.

• Typical use: Communication with SLC 5/01, 5/02 and 5/03 processors and other DH-485 devices.

• Power requirements: 24 V DC (supplied externally or from connected system – see diagram on back and AB manual).

• Connections (per documentation; confirm with photos):

  • PC side: RS-232 serial via DB connector (through attached cable/hardware).

  • PLC/network side: DH-485 interface via terminal connections indicated on rear wiring diagram (Data A/Data B, 24 V, GND, Shield, etc.).

• Ratings/approvals: UL and CSA listed for Class I, Groups A–D, Division 2 hazardous locations, temperature code T3C (per front label).

• Mounting: Small plastic enclosure with corner mounting holes.

• For full wiring and configuration, see Allen‑Bradley installation instructions 1747‑IN024.​

Condition

• Used, in good cosmetic and working condition as stated.

• Housing shows light scuffs, marks and minor discoloration from normal use.

• Front and rear labels are intact and legible, including wiring diagram and serial number.

• Attached ribbon cable present with connector at the end; insulation appears intact in photos.

• No additional accessories, manuals or cables included beyond the converter and attached cable.

Notes

• This is a legacy interface and generally supported only with native COM1/COM2 serial ports (not with USB‑to‑serial adapters); check Rockwell’s notes before purchase.

• Intended for maintenance of existing SLC 500/DH‑485 systems; newer installations typically use 1747‑UIC USB‑to‑DH‑485 converters instead.

• Buyer should verify compatibility with their specific PLC model, programming software version (e.g. RSLogix 500), and PC hardware/OS.