How is an EPE5, MEB, RM14K, SPE4, or UCM4 used without a PLC rack?
• The NRK2 is used to mount and power a single Niobrara SY/MAX module for stand-alone operation. • Must I rack address an EPE5, MEB, or SPE4 PLUS? • Only if you are using the mailbox registers for I/O between the module and the PLC. Most installations simply use the card as a protocol translator/router and do not use the mailbox registers at all. The module may often be placed in slots 17 and 18 on an HRK300 rack. • When is the external power supply needed on the SC902 cable? • The external power supply is needed on ports that use active RTS/CTS RS-422 handshaking such as the following: • All Square D NIMs • Square D SFI-510 SY/LINK RS-422 port • SPE4-1D and SPE4-2D Ports 1, 2, 3, or 4 • AIM4-1D, AIM4-2D, and AIM4-2M Ports 1, 2, 3, or 4 • UCM4-D and UCM4-M Ports 1, 2, 3, or 4 • RM14K • All EPE5 RS-485 ports • All MEB ports • Many SY/MAX ports provide 5VDC so the external power supply is not needed on the units that follow: • All Square D PLCs (Model 100 or greater) • Every SPE4 Port 0
