Central Processing Unit
5–2
1070 072 145-102 (01.07) GB
Unit functions
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
PLC program memory
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.
Functional features
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.
ZE200, ZE200A, ZE200M, ZE200AM, ZE201, ZE200-DP, ZE200A-DP
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
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