Bosch CL200 User Manual page 48

Central Processing Unit
5–2
Unit functions
PLC program memory
Functional features
ZE200, ZE200A, ZE200M, ZE200AM, ZE201, ZE200-DP, ZE200A-DP
D Decoding and processing instructions and commands contained in the
PLC program
D Memory management for data received from peripherals
D Detection and processing of interrupt signals
D System monitoring
To facilitate PLC program storage, the central processing units feature two
internal memory areas.
D 128 kB of internal RAM
D 128 kB Flash-EPROM memory
With a memory backup battery installed in the NT200 power supply mo-
dule, the PLC program can be processed from within the internal 128 kB
RAM.
When operating without backup battery, the PLC program is processed
from within the 128 kB Flash-EPROM memory.
Also possible is mixed operation using both RAM and Flash-EPROM me-
mory for data storage.
When operating with RAM or Flash-EPROM, the following memory capaci-
ties are available to store the application program:
D 12 kB instructions plus 16 kB data modules, OR
D 18 k instructions without data modules
These values are doubled in mixed operation.
The selection of RAM and Flash-EPROM memory and the definition of
mixed operation is accomplished with the use of the PLC utility program. Re-
fer also to order no. for "CL200 Operations List", in section 1.6.
D Cyclical program processing w/ OM1 organization module
D Setting system parameters in OM2 organization module
D Controlling program processing via organization module OM5 or OM7
D Error management in OM9 organization module
D 2 organization modules for timer controlled functions
D 3 organization modules for interrupt inputs
D Fixation of inputs/outputs and markers
The instruction set used with the CL200 is upward compatible for use with
the CL400 and CL500 controllers.
Seven variants of the central processing unit are available to ensure optimi-
zed and cost effective adaptation of the CL200 to a variety of tasks:
D ZE200
System clock, high-speed counters, interrupt inputs
D ZE200A
System clock, high-speed counters, interrupt inputs, 4 analog inputs, 1
analog output
1070 072 145-102 (01.07) GB