Overview of the SEF 100 Control System
There are three mircoprocessors that control all function and sequencing for the Sandretto SEF 100 control system.
The mircoprocessor are a Intel 8088 8 bit data and 20 bit address (up to 1 Meg of memory access). These mircoprocessor run
at a clock speed of 4.7MHZ.
CPU Functions
1. Mirco A: this portion of the Mirco AB board controls the video screen display and selections, the operator inputs
and controls the communications between the printer and floppy disk. Clock rate for this is 10 ms.
2. Mirco B: this portion of the mirco AB board controls
2a. All temperature regulation and outputs
2b. Total machine manual and automatic functions
2c. Alarm monitoring
3. Mirco C: this stand alone board controls all proportional hydraulic function (velocity and pressure)
All three CPUs handshake (communicate) through dynamic ram (known as a Dual Port) Each pair of CPUs share
a common 64K dynamic memory.
Mirco A (receives and sends data to Dual Port for CPUs B)
Mirco B (receives and sends data to Dual Port for CPUs A and C)
Mirco C (receives and sends data to Dual Port for CPUs B ). However mirco C can directly access the dual port for
Analog to Digital conversion data.
Interrupts from all three CPUs control the flow of data in and output of the Dual Ports.
Interrupts control is done with the 8259 control chip and with all CPUs interrupt "0" has the highest priority
Interface Boards and the Backrack layout
These boards are controlled by Mirco B
Slot 1 = 24 input and 16 output board for Automation options.
Optional on S8 and Mega T, standard on Mega HCS
Slot 2 = Robot Euromap 12 board, optional
Slot 3 = BNC Board for remote monitoring (pressure and position) optional
Slot 4 = Encoder interface board for Automatic die Height adjustment, optional.
Slot 5 = 24 input and 16 output board
Slot 6 = 16 input and 24 output board
Slot 7 = 16 input and 24 output standard interface board, required.
Slot 8 = Transducer interface card for Mold and Ejectors, required.
Slot 9 = Transducer interface card for Screw and Carriage, required
These boards are controlled by mirco C
Slot 10 = Tie bar Strain gauge interface card, required on MEGA - HCS
Slot 11 = Phillips or MTS Large machine transducer interface card, required on MEGA - HCS
Slot 12 = Standard 16 input and 24 output board
Slot 13 = Proportional Output Card for EV3, EV4, EV5, EV7, EV8 and EV23 valves.
Slot 14 = Proportional Output Card for EV14 and EV15 Ejector proportional valves
