optional redundant power supplies with separate mains power feeds
l optional system battery backup is also available, and
l a memory RAM battery is provided to supply memory retention power for the C300 Controller
The capabilities and options available with the Series-C power system are very similar to those
available with the Process Manager Power System.
Refer to the Series C Power Supply in the C300 Controller User Guide additional power system
information.
4.7 Fusing - Series C IOTA boards
Series-C I/O modules are constructed to support normal field failures, wiring errors and conditions
such as a shorted wire. All Series-C IOTAs contain at least one fuse that provides protection for
catastrophic errors in the IOTA, IOM and other elements of the Series-C system. In normal
operation as well as many abnormal operations, the fuse element should not blow.
The following attributes apply to all Series-C I/O modules:
l 24V DC power is protected by a fuse mounted on the IOTA.
l For redundant IOTAs, a fuse is provided for each IOM. If one fuse element were to blow, the
partner IOM continues to operate.
ATTENTION
In virtually all instances of normal field failure, the I/O module will recover without any
maintenance action such as replacing a component or fuse.
To access the parts information for the fuses associated with each board and module, refer to
Series C recommended spares in the Recommended Spare Parts section
