Digital input

Note

Wiring the digital input

To ensure correct function of the digital input, in addition to the 24 V signal at connection point 1 for DI+ Ch1 or connection point 8 for DI+ Ch2, the corresponding ground connection must also be connected to connection point 10 for DI- Ch1 or connection point 16 for DI- Ch2.

The EL5072 has two digital inputs for voltages from 5 V_DC to 24 V_DC. One digital input per channel can be used as follows

Set position value: The position can be set to a specified position value via an edge ("Set position on digital input", index 0x70n0:02)
Save position value: The position value can be stored in a separate process data via an edge ("Enable latch on digital input", index 0x70n0:03)

Index 0x80n0:06 "Enable continuous digital input" can be used to parameterize whether the function is executed at every parameterized edge or only once after every activation.

Furthermore, it is possible to disable the digital input.

Set position value via digital input ("Set position on digital input", index 0x70n0:02)

Index 0x80n1:1B "Digital input polarity" can be used to define the level at which the position value is to be set to a specified value:

0: input disabled
10: positive edge
11: negative edge

Position value specification via 0x70n0:11 "Set position value".
Index 0x70n0:02 "Set position on digital input" = TRUE
With the first parameterized edge (positive or negative) at the digital input the current position value (0x60n1:01) is set to the preset position value (0x70n0:11).
For confirmation the "Set position done" bit in index 0x60n0:0B is set to TRUE.
The position specification cannot be reactivated until index 0x70n0:02 has been set to FALSE.
Index 0x80n0:06 "Enable continuous digital input" can be used to specify whether it is necessary to reactivate the command:

FALSE:
The following pulses at the digital input have no influence on the position value in index 0x60n1:01 "Position" if the bit in index 0x70n0:02 is set.
A new position value can be written when index 0x60n0:0B "Set position done" is FALSE.
TRUE:
The position value 0x60n1:01 "Position" is set to the specified position value (0x70n0:11) with each parameterized edge at the digital input.
Renewed activation of the index 0x70n0:02 is not necessary.
The index 0x60n0:0B "Set position done" is set to TRUE on a registered edge for a PLC cycle.

The status of the digital input can be recorded via index 0x60n0:08 "Digital input".

Saving the offset value ("Set Position Offset", index 0x90n0:11

An inductive measuring probe provides an absolute measured value, i.e. the position value does not have to be referenced after a voltage interruption.

If a position specification is carried out via the process data 0x70n0:01 "Set position" or 0x70n0:02 "Set position on digital input", the offset value is stored in index 0x90n0:11 "Set Position Offset".
The offset value can be reset to zero in the FB command object 0xFB00 "Command" by the following commands.

Command	Description
0x8010	Deleting the offset value for both position values
0x8011	Deleting the offset value for position value of channel 1
0x8012	Deleting the offset value for position value of channel 2

	Command entry via the System Manager If the command input is written via the System Manager, the value must be entered in the "Binary" field (LOWBYTE first). If the command is initiated via the PLC, then this takes place automatically.

Save position value via digital input ("Enable latch on digital input", index 0x70n0:03

Index 0x80n1:1B "Digital input latch polarity" can be used to specify the level at which the position value is to be stored in a separate process data.

0: input disabled
10: positive edge
11: negative edge

Index 0x70n0:03 "Enable latch on digital input" = TRUE
At the first parameterized edge at the digital input the current position value is stored in index 0x60n1:02 "Latch value".
For confirmation the "Latch extern valid" bit in index 0x60n0:0A is set to TRUE.
A renewed activation for saving the position value can only take place when index 0x70n0:03 has been set to FALSE.
Index 0x80n0:06 "Enable continuous digital input" can be used to specify whether it is necessary to reactivate the command

FALSE:
The following pulses at the digital input have no influence on the latch value in index 0x60n1:02 "Latch value" if the bit in index 0x70n0:03 is set.
A new position value can only be written to index 0x60n1:02 "Latch value" when index 0x60n1:0A "Latch extern valid" is FALSE.
TRUE:
The position value 0x60n1:01 "Position" is written to index 0x60n1:02 "Latch value" for each parameterized edge at the digital input.
Renewed activation of the index 0x70n0:03 is not necessary. The index 0x60n0:0A "Latch extern valid" is set to TRUE on a registered edge for a PLC cycle.

The status of the digital input can be recorded via index 0x60n0:08 "Digital input"

	Parameterization of the digital input The parameterization of the digital input via index 0x80n1:1B "Digital input latch polarity" and index 0x80n0:06 "Enable continuous digital input" applies simultaneously to the functions "Set position on digital input" index 0x70n0:02 and "Enable latch on digital input" index 0x70n0:03.