ABB AC 800M

CI853 and TP853 – RS232-C Interface Appendix A Hardware Units
162 3BSE 027 941 R301
Functional Block Diagram
Figure 38. Block Diagram – CI853
DC/DC
Bus interface
Microprocessor with
FPROM, SRAM,
+5V
+24 V
Communication Extension Unit
Communication Extension Base plate
Communication lines
Communication
Extension Bus
Communication
Extension Bus
Dual Port RWM and
two serial interfaces
converter