Siemens 6ES7403-1TA01-0AA0 SIMATIC S7-400 ER1 18-Slot PLC Rack

The Siemens 6ES7403-1TA01-0AA0 SIMATIC S7-400 ER1 rack is an 18-slot extension rack for signal modules only, carrying the P bus and accepting two redundant power supplies. It measures 482.5 mm wide by 290 mm high by 27.5 mm deep and weighs approximately 4.2 kg. Rated ambient operating temperature is 0 to 60 degrees C.

Technical Specifications

Certifications & Standards

• CE
• UL
• FM
• RCM
• KC
• EAC

Selection Notes

The ER1 carries only the P bus across all 18 slots and holds signal modules, not a CPU, so it adds I/O capacity to an existing central rack without adding bus segmentation. Choose it over the smaller extension rack when a single expansion needs more than 9 additional signal-module slots.

Applications

With 18 slots for signal modules alone, the ER1 handles a large I/O expansion in a single rack rather than splitting it across two smaller extension racks, useful when a plant or process controller has outgrown the I/O count of its central rack. The two redundant power supply positions keep this larger I/O block powered if one supply fails, and its 482.5 mm width, 290 mm height and 27.5 mm depth closely match the mounting envelope of a standard S7-400 central rack.