Accessories / Miscellaneous > Relays/ PCBs/ Timeclocks/ Interlocks

IB1 Interlock Controller PCB Version 2.0

IB1 Interlock Controller PCB Version 2.0



Alpro’s IB1 Interlock Controller is designed specifically to be used as part of an access control system, with emphasis on the control of doors within that system, which need to interlocked. That is to say, when one door is closed and locked the other door can be opened and operated.

The interlock controller is a dual voltage unit operating on either 12/24v DC and offers flexibility with pluggable terminal blocks and nylon stick on mountings, which allow for expansion of the units capabilities.

IB1 Interlock Features Include:

  • Independent controls for each door; time settings and door override inputs
  • Microprocessor controlled logic: fully expandable to infinite number of doors – simply connect additional IB1 controllers as required
  • Monitoring: 2 x LED Indicators for door status. 9 Engineering LEDs for quick diagnostics
  • 12 or 24 VDC with high load capacity (5 Amp)
  • Flexible Installation: Pluggable terminal blocks with nylon stick-on mountings supplied
  • Dual Alarm Output: Selectable door forced or door left open alarm output


The Alpro IB1 interlock controller is also equipped with various adjustable time settings for door opening times and alarm delay.

The overall function of the interlock controller is to control the ingress and egress of traffic between various doors that require a specific opening and closing sequence. For example in the case of a clean room where it is imperative that one door is closed to ensure no foreign material can enter the clean room, before the entrance door to the room is opened.

The IB1 interlock controller also have the facility to show the status of the doors, via its LED built in function. The unit is further equipped to be fully expandable, to allow an infinite number of doors to be added to the system.

Dual Voltage
12 or 24vDC

High Load Capability
5 Amp double pole change over relay (1 powered output, 1 volt free) NO, NC, C – Per Door.

Flexible Installation
Pluggable terminal blocks
Nylon stick-on mountings supplied

Dual Alarm Output
Selectable door forced or door left open alarm output
1 Amp full changeover relay output.

Dip Switch Controls
Accurate switching for simple and constant door control
0-62 seconds adjustable door open time
0-45 seconds adjustable door alarm delay

Cancels Remaining Door Open Time
On closing of active door, allowing other doors to open

Independent Controls For Each Door
All Inputs and outputs are individual for each door including timer settings and door override inputs

Door Status LED Output
LED output allows remote signal indication to show door status

Engineering LED’s
9 LED’s allow simple diagnostic testing to be carried out in seconds.

Fully Expandable To Infinite Number Of Doors
Simple cross wire connection allows additional boards to be connected creating a complete interlock system of an infinite number of doors. Simply connect additional IB1 controllers as required.

Locked or Unlocked Modes
Controller will operate in both Secure ‘All Doors Locked’ mode or Convenience ‘All Doors Open’ mode to suit all applications.

Additional Information


Just want to enquire?
SKU: IB1 Category: Tag:

Any Questions?

Our specialist team can advise on the best products to suit your needs. Just enter your number here and a member of our team will call you back to discuss which solutions are suitable for your requirements.