90-30 Main Cpu
CPU Types for Series 90-30 PLCs
There are numerous CPU models available for the Series 90-30 PLC, each differing in speed, I/O capacity, memory size, and advanced features. This wide range provides system designers with flexibility in choosing the most suitable option for their specific needs.
CPU Types:
Embedded CPUs:
Key Features: These are cost-effective but lack the power and expandability of modular systems. The CPU is soldered directly onto the baseplate and cannot be replaced or upgraded. If your application requires more than 10 modules, you will need a modular CPU system, as embedded CPUs do not support expansion or remote racks.
Models: IC693CPU311, IC693CPU313, IC693CPU323.
Slots and I/O: Models 311 and 313 come with 5 slots, while model 323 has 10 slots. Since the CPU is embedded, all slots, including Slot 1, can be used for I/O or option modules.
Memory and Battery: The memory backup battery is located in the power supply, and if disconnected, a “super capacitor” can temporarily maintain memory. However, there is no built-in time-of-day (TOD) clock in these CPUs.
Modular CPUs:
Flexibility: Modular CPUs offer more expandability and can be replaced or upgraded easily. The CPU is installed in Slot 1 of a modular baseplate, which is reserved for CPU or special option modules. These CPUs also support expansion and remote racks.
Models: CPU331 and above.
Time-of-Day Clock: All modular CPUs come with a built-in time-of-day clock, providing additional functionality for time-sensitive applications.
General Features:
Microprocessors: The type of microprocessor varies between models:
80188 for CPU models 311/313/323/331
80386EX for CPU models 350-364
586 for CPU374
These microprocessors handle all basic operations, with dedicated hardware for boolean logic in modular models.
RAM Memory: All Series 90-30 CPUs use RAM as working memory. In modular CPUs, the RAM is housed within the CPU module, while in embedded models, it is mounted on the baseplate. A backup battery is necessary to prevent data loss when power is off.
PROM Types: There are three types of programmable read-only memory (PROM):
EPROM: Can be erased with ultraviolet light and reprogrammed externally.
EEPROM: Can be erased and reprogrammed while installed in the PLC.
Flash Memory: Allows firmware updates through the serial port, without needing to remove modules.
In conclusion, for applications requiring flexibility and future scalability, modular CPUs are the best choice. For smaller, more fixed systems, embedded CPUs are a cost-effective solution. Always consider memory backup and power supply requirements to ensure data integrity.
>> ++ 90-30 User manual (pdf)
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