GE Fanuc IC692CPU211D / IC692MDR541C

The Series 90-30, 90-20, and Micro PLCs are members of the GE Fanuc Series 90 family of Programmable Logic Controllers (PLCs). They are easy to install and configure, offer advanced programming features, and are compatible with the Series 90-70 PLCs.

The Series 90-20 PLC provides a cost-effective platform for low I/O count applications. The primary objectives of the Series 90-20 PLC are as follows:
· To provide a small PLC that is easy to use, install, upgrade, and maintain.
· To provide a cost-effective family-compatible PLC.
· To provide easier system integration through standard communication hardware and protocols.
The Series 90 Micro PLC also provides a cost-effective platform for lower I/O count applications.
The primary objectives of the Micro PLC are the same as those for the Series 90-20. In addition,the Micro offers the following:
· The Micro PLC has the CPU, power supply, inputs and outputs all built into one compact device.
· Most models also have a high speed counter.
· Because the CPU, power supply, and inputs and outputs are all built into one device, it is very easy to configure.


The 341 and lower Series 90-30 PLCs and Series 90-20 PLC use an 80188 microprocessor. The 35x and 36x series of 90-30 PLCs use an 80386EX microprocessor. The 37x series of 90-30 PLCs use a 586 microprocessor. The Series 90 Micro PLC uses the H8 microprocessor. Both program execution and basic housekeeping tasks such as diagnostic routines, input/output scanners, and alarm processing are supported. The system firmware also contains routines to communicate with the programmer. These routines provide for the upload and download of application programs, return of status information, and control of the PLC.

In the Series 90-30 PLC, the application (user logic) program that controls the end process to which the PLC is applied is controlled by a dedicated Instruction Sequencer Coprocessor (ISCP). The ISCP is implemented in hardware in the Model 313 and higher and in software in the Model 311 systems, and the Micro PLC. The microprocessor and the hardware-based ISCP can execute simultaneously, allowing the microprocessor to service communications while the ISCP is executing the bulk of the application program; however, the microprocessor must execute the non-Boolean function blocks.

See also: Fanuc IC692CPU211D / IC692MDR541C, GE IC692CPU211D / IC692MDR541C