Flexible Automation
Central processing unit ZS400
4-1
1070 072 143-101
4 Central processing unit ZS400
Task
D Decoding and processing of commands in PLC program.
D Management of memory area for the data in the peripherals.
D Recognition and processing of interrupt signals.
D System monitoring
D Central system clock with calendar and alarm function
For the purposes of storing PLC programs, the central processing unit
ZS400 has an internal 256 kByte RAM memory. The PLC program is always
executed from the internal 256 kByte RAM memory.
Memory card
The central processing unit ZS400 has a plugin fixture for a memory card.
The memory card facilitates ZS400 operation without a buffer battery.
However, the PLC program being run is executed from the 256 kByte RAM
memory even when a memory card is in use and thus facilitates the use of
data modules as write/read memories. This is a major advantage of the
memory card in comparison with EPROM use up to now.
The ZS400 firmware can be loaded from a memory card.
The PLC program can be stored on a memory card or loaded from a mem
ory card.
Features
D Cyclic program execution with organisation module OM1
D Setting of system parameters in organisation module OM2
D Program startup controlled via organisation module OM5 or OM7
D Fault management in organisation module OM9
D 9 organisation modules for timers
D 8 organisation modules for interrupt inputs
D 16 organisation modules for system interrupts
D Definition of inputs/outputs
Fig. 4-1 ZS400
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