Yaskawa CPS-IONB PLC DC Power Supply Module: Comprehensive Guide for Industrial Automation

26. januar 2026

Historical parts record: Photos and notes below belong to this record. Confirm the offered unit’s full model, condition and available test evidence before ordering.

The Yaskawa CPS-IONB is the DC power supply module for Yaskawa's Memocon PLC racks — a card-edge unit that plugs into the backplane on a 96-pin DIN connector and produces three rails: +5 V, ±12 V and +24 V, from a 300 VA, AC 200/220 V 50/60 Hz input. The nameplate carries serial 91.1 and revision C (punched on the ABCDEFGHJK strip). Used pull, condition as-shown clean — received 2026-01-26, 3 kg packed, 3-month warranty.

What the nameplate says

Item	Value on label
Model	CPS-IONB
Type	DC POWER SUPPLY (Memocon rack module)
Input	AC 200/220 V, 50/60 Hz, 300 VA
Outputs	+5 V, ±12 V, +24 V
Serial	91.1.…. (partially worn)
Revision	C (punch mark on the letter strip)
Origin	YASKAWA, JAPAN

The panel window lists the status LEDs in order: SOURCE, POWER ON, +5V/±12V, +24V, EXT, ALARM — a quick health read without opening the rack.

Yaskawa CPS-IONB full view — The unit full-length: long aluminum chassis with the CPS-IONB nameplate at the top, LED window beside it, and the mounting ears at the bottom.

CPS-IONB nameplate close-up — Nameplate close-up: DC POWER SUPPLY, INPUT AC 200/220V 50/60Hz 300VA, SER NO. 91.1.…, REV NO. strip punched at C, YASKAWA JAPAN, with the LED legend column on the right.

Connectors

CPS-IONB backplane edge — The rack edge: the 96-pin DIN backplane connector in its white frame, the I/O header block with its factory wiring, and the card-guide brackets that locate the module in the Memocon cage.

CPS-IONB 96-pin connector — The 96-pin DIN connector straight on — two rows of gold contacts in the white housing, guides at both ends.

CPS-IONB wiring side — The wiring face: three white header blocks (CN11/CN12/CN13) with their leads in yellow, green, red, white and black — DC output and alarm taps leave here, not from the backplane.

Video: the module rotated — nameplate, connectors and internals in sequence.

Internals

CPS-IONB inside — Inside the case: the main reservoir capacitor, the CE-US 50 V filter bank, and the soldered leads to the header blocks — a linear-era design with generous spacing.

CPS-IONB regulator side — The regulator side: TO-3 pass transistors on the bracket, the green cement resistor bank for bleed and sense loads, and the red sense lead across the board.

CPS-IONB components — Closer in: the TO-3 socket, control IC on its carrier, ceramic resistors and the wiring dress — no corrosion, connectors clean.

Casing

CPS-IONB rear cover — The rear cover in yellow-zinc plate with its vent slots and locator dimples.

CPS-IONB bottom — The other plated face — same finish, rails intact for the card cage.

A note on the photo set

One archive photo showing a CPS-10NB panel (serial S19803C) came in with this record's list — that is a sibling model from another unit and is excluded here; every photo above shows the actual CPS-IONB delivered.

Service notes

At 1991 vintage, the reservoir capacitor is the first thing to suspect if a rail reads low or the ALARM LED stays lit; the TO-3 pass devices rarely fail but their insulating washers dry out. The three-rail structure means a dead ±12 V kills the analog side while +24 V I/O keeps working — match the symptom to the LED column before pulling the module.