Rockwell Automation 309777-05 Industrial Automation Module - Complete Technical Overview
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What is the 309777-05 cable?
A 5-metre Heidenhain-compatible encoder feedback cable, part-number group 309777, made in China as a new aftermarket unit — the cable that runs from a Heidenhain scale or encoder to the CNC's interface module (the -03 sibling of this part number is listed against the FANUC module A02B-0236-C205). One end carries a 12-pin metal circular connector with a keyway, the connection face used on Heidenhain encoder/scale ports; the other end is a numbered pigtail of colour-coded conductors ready for the drive cabinet. The cable itself is a green oil-resistant PUR jacket with a foil-shielded core group — the jacket print reads 4×0.5mm² + 2×0.34mm² · 3C · AWG STYLE 20554 · 80°C · 300V · DC30U RoHS · oil resistance · E326324. One piece, about 1 kg, new, recorded 24 November 2025. Six photos and a warehouse video below.
Part details
| Field | Value |
|---|---|
| Part number | 309777-05 (Heidenhain 309777 group, 5 m length) |
| Fits | Heidenhain scale / encoder feedback runs; sibling -03 is sold for the FANUC module A02B-0236-C205 |
| Encoder end | 12-pin keyed metal circular connector, two-part nickel shell |
| Drive end | Colour-coded pigtail, conductors in white numbered heat-shrink sleeves |
| Jacket | Green PUR/TPE, oil resistant, drag-chain flexible |
| Core group | 4 × 0.5 mm² + 2 × 0.34 mm², 3C — foil shield with drain wire |
| Ratings | UL STYLE 20554, 80°C, 300V, E326324 (UL file), RoHS |
| Length | 5 m |
| Origin | Aftermarket, made in China (new) |
| Weight | About 1 kg |
| Intake recorded | 24 November 2025 |
What to check before you plug it in
Encoder cables fail quietly — an axis that ghosts, alarms on acceleration, or loses reference counts is often a cracked conductor in a drag chain, which is why this 309777 line gets bought as a spare rather than waiting for the failure. Three things to verify on arrival. First, the pin count and keyway: the 12-pin keyed face matches the Heidenhain-side port, and forcing a mis-keyed connector bends pins you cannot see. Second, the wire colours on the pigtail: aftermarkets sometimes shift a colour against the original Heidenhain schedule, so land the pigtail by the printed sleeve numbers and the module's pin list, not from memory of the old cable. Third, the shield: the foil wrap and its drain wire must land on the module-side earth — an ungrounded shield turns the whole run into an antenna, and that shows up as counts jitter long before anything breaks. The PUR jacket in the photos is drag-chain grade and oil resistant, so it belongs on the moving axis, not zip-tied to a stationary conduit.
Photos
All images below are original warehouse photos of the exact cable covered by this record, taken before dispatch. Click any photo to view it full size.
The -03 sibling of this cable family is listed in our shop as the Heidenhain 309777-03 cable for FANUC A02B-0236-C205.
Sourcing help
KOEED supplies encoder cables, scales and CNC interface parts in new stock. Send the part number for a quote.
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