EL3174 - Connection, display and diagnostics

EL3174 - Connection, display and diagnostics 1:Fig.48: EL3174 - LEDs and Connection

Connection EL3174

Terminal point

Description

Internally connected
with connection

Max. current carrying capacity *)

Name

No.

Ch1 U+

1

Channel 1, voltage measurement, positive input (U+)

-

not applicable (voltage input)

Ch2 U+

2

Channel 2, voltage measurement, positive input (U+)

-

not applicable (voltage input)

Ch3 U+

3

Channel 3, voltage measurement, positive input (U+)

-

not applicable (voltage input)

Ch4 U+

4

Channel 4, voltage measurement, positive input (U+)

-

not applicable (voltage input)

+24 V

5, 6, 7, 8

+24 V

positive power contact

1 A

Ch1 U-

9

Channel 1, voltage measurement, negative input (U-)

-

not applicable (voltage input)

Ch2 U-

10

Channel 2, voltage measurement, negative input (U-)

-

not applicable (voltage input)

Ch3 U-

11

Channel 3, voltage measurement, negative input (U-)

-

not applicable (voltage input)

Ch4 U-

12

Channel 4, voltage measurement, negative input (U-)

-

not applicable (voltage input)

Input Ch1

13

Channel 1, current measurement, input (I)

-

40 mA

Input Ch2

14

Channel 2, current measurement, input (I)

-

40 mA

Input Ch3

15

Channel 3, current measurement, input (I)

-

40 mA

Input Ch4

16

Channel 4, current measurement, input (I)

-

40 mA

*) Constant and peak value

EL3174 - Connection, display and diagnostics 2:

Overcurrent protection of the 20 mA inputs

The current inputs are protected against damage by overcurrent by an internal current limitation, currents > 30 mA may occur.

  • In the event of a fault, the current limiter must not be overloaded by a voltage > 30 V from the source device.
  • Overcurrent is displayed in the process image as "Overrange".
  • After occurrence, the error condition must be stopped immediately, the source device switched off or disconnected from the input terminal.
  • If the error condition persists for a longer period of time, the internal terminal current limitation reduces the absorbed signal current for thermal reasons, depending on the ambient conditions also below 20 mA.

LEDs

LED

Color

Meaning

RUN*

green

This LED indicates the terminal's operating state *:

off

State of the EtherCAT State Machine: INIT = initialization of the terminal or BOOTSTRAP = function for firmware updates of the terminal

flashing

State of the EtherCAT State Machine: PREOP = function for mailbox communication and different standard-settings set

single flash

State of the EtherCAT State Machine: SAFEOP = verification of the Sync Manager channels and the distributed clocks.
Outputs remain in safe state

on

State of the EtherCAT State Machine: OP = normal operating state; mailbox and process data communication is possible

ERROR**

red

Fault indication in the event of broken wire or undershooting or overshooting of the measuring range

*) If several RUN LEDs are present, all of them have the same function.
**) The error display shows the signal processing state for each channel.