Rockwell Automation T80017 Application Note Regent to Trusted Migration - Manual (Page 4)

Trusted TM
AN-T80017 Regent to Trusted Migration
Issue 2 June 08 AN-T80017 4
2. Electrical
The chassis and its modules are powered from a dual 24Vdc (nominal) supply, each supply providing
at least 250W through 20A MCBs.
If the Regent system power supplies are to be replaced, the T8200 range is recommended. These
have 250W units in sets of three to match the Regent power needs. Regent chassis require extra
diagnostic signals to start the system once the supply has settled and to warn it of impending loss of
power, and the T8200 range provides these signals. An interface board T8294 is available to provide
connections to four Regent chassis, including the diagnostic signals.
In the example shown in Figure 2, the Trusted chassis is powered by T8240 power shelves containing
T8231 supplies, which also replace existing bulk supplies powering the general 24V requirements in
the system and field.
2.1. Communications
The T8160 connects to the nearest Regent chassis using a TC-320-01 cable as shown in Figure 1. It
can also be connected to the end of the original Safetybus cables to the processor chassis using a TC-
321-01 cable. This has connectors to match the existing cables. The existing chain of safetybus cables
is used to communicate with the remaining chassis.
Figure 1 Safetybus Wiring Example