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ET 200L Distributed I/O Device
EWA-4NEB 780600902-05
The terminal block (TB) is used for mounting the electronics block (EB). It
contains the wiring so that if the electronics block is replaced, leads do not
have to be loosened.
The terminal block is characterized by the following:
S It can be pre-wired before the electronics block is mounted.
S Depending on the design, wiring can be connected by means of screw-
type or spring terminals.
S It has a two-wire termination and can be upgraded to a three- or four-wire
termination by using supplementary terminals.
S It does not contain any active electronic components. The terminal block
cannot therefore be destroyed electrically.
S You can insert different electronics blocks.
S There are 16-channel (TB 16L) and 32-channel (TB 32L) terminal blocks.
The electronics block contains the logic circuitry and is inserted into the ter-
minal block and screwed. It is characterized by the following:
S It defines the number of input/output channels.
S You do not have to loosen the terminal lead to replace the electronics
block; you merely have to remove the bus connector.
S The PROFIBUS-DP is connected via a bus connector to the electronics
block.
S You can set PROFIBUS addresses 1 to 99.
S There is galvanic isolation between the PROFIBUS-DP and the internal
electronics.
S LEDs are used to display: The voltage supply of the electronics block
(ON), bus faults (BF), group errors (SF; not for ET 200L), the status of
inputs and outputs
S There is a labeling strip in the electronics block for clear identification of
inputs and outputs. You can order the labeling strip separately (refer to
Appendix A.1).
S A circuit diagram is displayed on the electronics block. The circuit dia-
gram is located beneath the labeling strip.
The internal processing time is < 1ms.
Terminal Block
Electronics Block
Processing Time
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