Skip to main content
Log in
Siemens 6ES7403-1JA00-0AA0 — PLC I/O & Expansion Modules

Siemens 6ES7403-1JA00-0AA0 S7-400 ER2 9-Slot Expansion Rack,

MPN6ES7403-1JA00-0AA0

Siemens SIMATIC S7-400, ER2 expansion rack, 9 slots, for signal modules only, order code 6ES7403-1JA00-0AA0.

Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Product details

The Siemens 6ES7403-1JA00-0AA0 is a SIMATIC S7-400 ER2 expansion rack with 9 slots, designed exclusively for signal modules — no CPU or power supply slot on this backplane. It extends the I/O capacity of an S7-400 system by housing up to nine signal modules (digital/analog input or output) in a separate chassis, connected via the rack bus to the central controller.

Integration note

Mounts in a standard 19-inch cabinet or panel; the rack connects to the S7-400 central controller via the backplane bus cable (not included). No DIN-rail clip — it bolts into the enclosure. Only signal modules populate these slots; the CPU and power supply reside in the central rack (UR1/UR2). Verify bus cable length and slot numbering before commissioning.

Frequently asked questions

What is the closest alternative to 6ES7403-1JA00-0AA0 in the S7-400 family?

Within the S7-400 family, the ER2 rack is a 9-slot expansion chassis for signal modules only. A direct functional equivalent would be another ER2 rack with the same slot count and bus interface — no pin-compatible drop-in exists outside the Siemens S7-400 line.

What does the description 'ER2 EXP. RACK, W. 9 SLOTS, F. SIGNAL MOD. ONLY' mean?

It means this is an expansion rack (ER2) with nine slots that accept only signal modules (digital/analog I/O). It does not have a slot for a CPU or power supply module; those go in the central rack.

MPN
6ES7403-1JA00-0AA0