More Info on the STBDDI3725KS:

Unity Processor Modicon Quantum - 548 Kb - 66 Mhz

Quantum | 140CPU31110 | Modicon | 140 CPU 311 10 | Processor 400K RAM

Unity processor Modicon Quantum - 548 kB - 66MHz Integrated connection type 1 Modbus Plus 2 Modbus Checks Process control Memory description Internal RAM 548 kB Switch function Slide switch communication port : ASCII/RTU/Memory Slide switch memory port/off Application structure No auxiliary task 64 interrupt tasks 64 I/O interrupt tasks 16 timer interrupt tasks 1 periodic fast task 1 cyclic/periodic master task Execution time per instruction 0.12...0.585 μs on word 0.12...0.585 μs Boolean 0.1...0.27 μs on fixed-point arithmetic 0.1...0.27 μs floating points Execution time for 1 K instruction 2.49 65 % Boolean and 35 % numerical 1.86 100 % Boolean System overhead 1 ms - master task 0.2 ms - fast task Bus current requirement 1800 mA Local signalling 1 LED red for communications error on the Modbus Plus port (ERROR A) 1 LED red for battery needs replacing or is not present (BAT LOW) 1 LED orange for write-protected memory (memory port) 1 LED green for CPU has passed the power-up diagnostic tests (READY) 1 LED green for CPU has been started and is solving logic (RUN) 1 LED green for communications are active on the Modbus port (Modbus) 1 LED green for communications are active on the Modbus Plus port (Modbus Plus) Electrical connection 2 female connectors, connector type: SUB-D 9 for connecting to the Modbus bus 1 female connector, connector type: SUB-D 9 for connecting to the Modbus Plus network.