3. Series 8 I/O Installation and Upgrades
3.7. Powering the Series 8 system
R500 Series 8 I/O User's Guide 49
April 2017 Honeywell
NOTES
1. Redundantly configured IOMs must be installed on a redundant IOTA.
2. Non-redundant IOMs can be installed on non-redundant and redundant IOTAs.
However, when installed on a redundant IOTA, non-redundant IOMs must be
installed in the upper IOM slot of the redundant IOTA.
3.7 Powering the Series 8 system
Supplying power to I/O modules
Power systems for the Series 8 control hardware provide the following:
Optional redundant power supplies with separate mains power feeds.
A memory RAM battery to supply memory retention power for the C300 Controller.
The capabilities and options available with the Series 8 power system are similar to those
available with the Process Manager Power System.
Refer to the Series 8 Power Supply in the C300 Controller User’s Guide for additional
power system information.
3.8 Fusing - Series 8 IOTA boards
Protecting the Series 8 I/O components
Series 8 I/O modules are constructed to support normal field failures, wiring errors and
conditions such as a shorted wire. All Series 8 IOTAs contain at least one fuse that
provides protection for catastrophic errors in the IOTA, IOM, and other elements of the
Series 8 system. In normal operation and many abnormal operations, the fuse element
should not blow.
The following attributes apply to all Series 8 I/O modules.
24V DC power is protected by a fuse mounted on the IOTA.
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 recovers
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 Fuse information in the Recommended Spare Parts section.
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