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Basic modules

24 LI. 24 Line Module

24 LI. 24 Line Module

At a Glance:

  • Control function for a total of 24 keys of call stations in line technology
  • Control functions and acknowledgements of command signalling systems (PABX)
  • Control functions for e.g. card racks

The DVS-21 is capable of connecting not just our own but also third-party de-vices. The module 4NPA makes possible an LF (low frequency) connection and control over the C and V point of four devices.

In order to meet other control requirements the line module 24LI is additionally required.

Application Description:

Application example for the 24LI with PA and intercom systems
Fig. Application example for the 24LI with PA and intercom systems

The line module 24LI manages various control functions when using one or more 4NPA modules.

The individual lines are independent of one another. If, for example, third-party devices are connected with line technology, a key/button is required for each line, which means e.g. with a 24LI-module four call stations each with three double toggles can be switched in.

More about the various applications can be found in the data sheet for the 4NPA module.

Function Description:

The principle functions are illustrated in the following block diagram.

Block diagram 24LI
Fig. Block diagram 24LI

The 24LI has 24 independent bi-directional inputs/outputs.

These lines are configured using the ICS software.

Input and output status is displayed for each line by an LED on the front plate.

The reference potential is earth or 0 V.

The output idle voltage of the lines corresponds to the system operating voltage, i.e. type -48 V. -24 V (optional) to a max. -60 V can be switched in. An active line puts through 0 V as output or is 0 V as input.

The line current is a maximum of 150 mA. The line is switched off in the case of excessive load.

The Front Panel Symbols and their Meaning:

The System Blinker The System Blinker
Addressing from processor taking place
I/O Input/Output
BUS output works as push-push operation with the system-blinker
BUS input works as push-pull operation with the system blinker
1..24 Send/Receive Status (depending on set)
LED blinks: LF signal being sent
LED lit: LF signal being received

Thechnical Data:

Operating Voltage: +/-5 V (control)
Line Output: 0 V/-48 V (control)
Line Input: 0 V/-48 V
Line Current: Max. 150 mA
Temperature Range: 0 °C to 45 °C
Weight: 300 g
Installation Height: 3HE
Installation Width: 6TE