HITACH_EI_(MLK-II)

Hitachi EI (MLK-II)

Hitachi EI is also Known as Ansaldo EI or MLK-II. The product name of this System is Microlok-II. This System is very much user-friendly for Indian Railways. Microlok II is a microprocessor based electronics interlocking System. It is a Single Processor system with diverse (dual) Software with extensive safe checks.

Table of Contents

Hardware of MLK-II :

MLK II hardware consists of the following components

Card File:

  • Slot No. 1 to 15 & 20 accommodate Non-Vital Input/Output or Vital Input or Vital Output boards. (Slot No. 20 is used to accommodate Coded System Interface Card or CSI Card for CTC.
  • Slot No. 16 & 17 accommodate Power Supply Board.
  • Slot 18 & 19 accommodate CPU board.
Microlock-ii-card-file
Microlock-ii-card-file

CPU Board:

The CPU board is controlled by Motorola 68332 microprocessor and stores the
Executive and Application software. It contains the central controlling logic and
diagnostic monitoring for the Microlok II system, and provides five serial data ports to
communicate with peripheral devices.

  • Ports 1 and 2 (RS-485 type) – for communication with other MLK systems.
  • Port 3 (RS-423/232 types) – for communication with non-vital control system such as operator’s PC/VDU Panel/CTC/Genesys.
  • Port 4 (RS-232 type) – for communication with non-vital control system such as VDU panel/CTC/Genesys/Indication Panel.
  • Port 5 (Debug port) (RS-232 type) – for communication with Maintenance PC for debugging.

Indications and buttons are avilable on front side of the CPU card as shown in below figure:

Microlok-ii-cpu-card
Microlok-ii-cpu-card
Fig. RefLabelDevicePurpose
1,2(None)4-character
alphanumeric
displays
On-site configuration
programming menus
and options.
3A,B,C,D,EYellow LEDsReserved for serial link
status.
41,2,3,4,5,6,7,8Red LEDsUser-defined in
application software
5ON LINEGreen LEDWhen lit, indicates normal
system operation
(successful diagnostics).
6VPP ONYellow LEDWhen lit, indicates
FLASH +5V or +12V
programming voltage
enabled (via board
jumper).
7RESETGreen LEDWhen lit, indicates that
the system is in reset
mode.
8RESETMomentary
pushbutton
When pressed, resets the
CPU. Also used to place
the CPU in the reset
mode.
9MENU L-R3-position
(return-tocenter)
toggle switch
Used to search main
program menu items
shown on displays.
10MENU UPDOWN3-position
(return-tocenter)
toggle switch
Used to select main
program menu items
shown on displays.
11ADJUST UPDOWN3-position
(return-to
center)
toggle switch
Used to cycle through
configuration values to be
selected with “ACTION”
switch.
12ACTION
ACCEPTREJECT
3-position
(returntocenter)
toggle switch
Executes or cancels
configuration value
selected with “ADJUST”
switch.
13RS-232 DTE
Diagnostic
Link
Connector
DB9, RS-232
Connector
(DTE)
Used for connection to
Maintenance PC for
System monitoring
diagnosis.

Power Supply Board

The power supply board performs the following functions:

  • Converts the external supply voltage (9.8V to 16.2V DC) to regulated +12V and +5 needed for the operation of the cardfile circuitry.
  • Provides an isolated source voltage for external contact sensing.
  • Supplies energisation voltage to the VCOR relay coil under the control of the CPU board.
  • As long as CPU detect no internal/external system faults, it sends a 250 Hz check signal to PS PCB which in turn holds the VCOR relay in pick up condition.
  • Failure of a diagnostic check results in removal of check signal thereby deenergisation of VCOR. This results in removal of power to all vital system output.

Power input to the system

  • Voltage range: 9.5 to 16.5 V DC
  • Min. Voltage: 12 V DC
  • Min. System Start-Up Voltage:11.5 V DC
MLK-ii-Power-pcb
MLK-ii-Power-pcb
Fig. RefLabelDevicePurpose
15V ONLED (green)When lit, indicates 5Voperating power on to other cardfile PCBs (If not lit refer to Figure-
2VCORLED (green)When lit, indicates conditional power on to VCOR relay (CPU diagnostics
normal). (If not lit refer “CPS CLEAR
FUNCTION” details in Figure
Power Supply PCB Indication

Non-Vital I /O Board

  • The Non-Vital I/O board is designed to receive non-vital inputs (controls) and generate non-vital outputs (indications).
  • Each PCB provides 32 inputs and 32 outputs through its rear 96 pin connector.
  • Available in 12 V and 24 V DC applications.
  • Non-vital inputs – Panel push buttons and keys.
  • Non-vital outputs – Panel indication LEDs, counters and buzzers.
  • LEDs are available on the front panel to show the status of non-vital input/output.
Fig. RefLabelDevicePurpose
1INPUTS 1-32Green LEDsMonitors states of
non-vital inputs 1-
32.
When LED is lit,
respective input is
on.
3OUTPUTS
(SWITCHED
TO N12) 1-32
Yellow LEDsMonitors states of
non-vital outputs 1-
32.
When LED is lit,
respective output is
on.
Non-Vital I/O Board Indication
MLK-II_Non-Vital_I /O_Board
MLK-II_Non-Vital_I /O_Board

Vital Output Board:

  • Each Vital Output PCB is having 16 independent 24 V outputs.
  • Each output is assigned to the final relay which is driving the outdoor signalling gears such as HR, DR in case of signal & WNR, WRR in case of points.
  • Since the output boards are driving outdoor gears, they are continuously monitored by the CPU and any abnormal voltage present in the output will lead to system reset / shutdown to ensure safety.
Fig.
Ref.
LabelDevicePurpose
1OUT1-OUT8Yellow
LEDs
Monitor state of
vital outputs 1
through 8.
When lit,
indicates
respective
output is turned
on.
2OUT9-OUT16Yellow
LEDs
Monitor state of
vital outputs 9
through 16.
When lit,
indicates
respective
output is turned
on.
Vital Output Board Indication
Vital-Output-Board
Vital-Output-Board

 

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