Racks Er1 (6Es7403-1Tax1-0Aa0) And Er2 (6Es7403-1Jax1-0Aa0) - Siemens SIMATIC S7-400 Reference Manual

Rack

2.6 Racks ER1 (6ES7403-1TAx1-0AA0) and ER2 (6ES7403-1JAx1-0AA0)

2.6 Racks ER1 (6ES7403-1TAx1-0AA0) and ER2
(6ES7403-1JAx1-0AA0)
Order number
The "x" variable has the following meaning for order numbers 6ES7403-1TAx0-0AA0 und
6ES7403-1JAx01-0AA0:
● x=0: Mounting rail made of sheet steel
● x=1: Mounting rail made of aluminum
Introduction
The ER1 and ER2 racks are used for the design of expansion racks.
The ER1 and ER2 racks have only one I/O bus with the following restrictions:
● Interrupts from modules in the ER1 or ER2 have no effect since there are no interrupt lines
provided.
● Modules in the ER1 or ER2 are not supplied with 24 V. Modules requiring a 24 V supply
are not provided for use in the ER1 or ER2.
● Modules in the ER1 or ER2 are not backed up either by the battery in the power supply
module or by the voltage supplied externally to the CPU or the receive IM (EXT.-BATT.
socket).
There is therefore no advantage in using backup batteries in the power supply modules in
ER1 and ER2.
Battery faults and backup voltage faults are not reported to the CPU. The battery monitoring
function of a power supply module installed in the ER1 or ER2 should therefore always be
switched off.
Suitable modules for ER1 and ER2
You can use the following modules in the ER1 and ER2 racks:
● All power supply modules
● Receive IMs
● All signal modules provided the above-mentioned restrictions are observed.
Special case: Power supply modules cannot be used in conjunction with the IM 461-1 receive
IM.
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S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08