Honeywell 10002/1/2 Central processor unit (CPU)

Honeywell 10002/1/2 Central processor unit (CPU)

Description

The central processor unit (CPU) is the heart of each FSC system. It controls all system operations.

The module has a key switch in the front which provides a hardware reset of the processor. The key switch has two positions:

• Vertical: running

• Horizontal: stop (CPU reset)

The CPU module is provided with battery back-up circuits for the RAM memory, which enables back-up supply from the batteries on the diagnostic and battery module (DBM, 10006/1/1 or 10006/2/.) or single bus driver (SBD, 10007/1/1).

Memory

The CPU module has the following on-board memory:

• 128 Kbytes of RAM for the system and application variables (all I/O, markers, counters, timers and up to 7 Kbytes for registers), and

• 128 Kbytes of RAM that can be used as application RAM (depending on jumper positions).

The available 128 Kbytes of application RAM makes it possible to run small application programs in RAM, without additional memory circuits in the dual in-line (DIL) sockets.

A separate memory print (10002/A/1) is placed in the connector strips on the 10002/1/2 module. The 10002/A/1 module accommodates surface-mounted EPROMs that contain the system program, and has four sockets which offer space for the application program memory (EPROMs or RAM).

Reprogramming the surface-mounted EPROMs is possible using the 07170/1/1 FSC EPROM programmer with a 07170/A/1 adapter module. The EPROMs are erased by placing the 10002/A/1 module in an EPROM eraser (UV light source).

Technical Specifications