The system modules are connected to the CPU on the left-hand side via a multi-pin connector. Internally they are connected via PCI Express. For the CX20xx family, up to four modules can be connected in any order. One module can be connected toCX52x0, CX53x0 or CX56x0.

Serial interfaces can be added with the module CX2500-0030 (RS422, RS485).

CX2500-0031 Giao diện nối tiếp RS485RS422 cho CX20xx, CX52x0, CX53x0, CX56x0

Technical data	CX2500-0031
Interfaces	RS422/RS485
Type of connection	2 x D-sub plug, 9-pin
Power supply	via system bus (through CX2100-0xxx power supply modules)
Dimensions (W x H x D)	24 mm x 99 mm x 54.5 mm
Weight	approx. 203 g
Relative humidity	95 %, no condensation
Operating/storage temperature	-25…+60 °C/-40…+85 °C
Vibration/shock resistance	conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission	conforms to EN 61000-6-2/EN 61000-6-4
Protection rating	IP20