Specifications

156 Module 125: Protege GX System Design | Understanding Physical Design
Centrally Located Equipment
Where cabinets are located together, and the RS-485 cable is well protected between them, this solution is also
considered robust.
ZX16 PX8
PSU
Cable protected by conduit
RDM2 RDM2
PX8
Controller
ZX16
Centrally locating equipment and running cable out to field devices can often be a cost effective way of
providing a robust solution.
External RS-485 Cabling
However, when the RS-485 Module Network leaves the cabinet, it is at risk of being damaged.
RDM2 RDM2
PSU
PX8
Cable is at risk of being damaged
Cabinet 1
Cabinet 2
Controller
ZX16
If the cable is completely cut here, the ZX16 and PX8 in Cabinet 2 will cease to function.
If the RS-485 Module Network cable is well run, and protected by cable tray or conduit where applicable, it is
unlikely to be damaged, and therefore unlikely to present a problem, however this is a risk that must be
considered during the designing and planning of a new system.
Sometimes the RS-485 Module network must leave the cabinet. For instance, when a keypad is required on the
system.