C300 Controller module and IOTA replacement 
To replace a redundant or secondary controller IOTA 
214  Experion C300 Controller User's Guide   R301.1 
 Honeywell 11/06 
Step Action 
of the controller. 
8 
Connect IOTA board to GND and 24 Vdc bus bars. 
•  Install screw through right side of IOTA board to tap into the GND bus bar 
of carrier.  
•  Install screw through left side of IOTA board to tap into the 24 V bus bar of 
carrier.   
9 
Install the two-wire twisted pair Battery cable onto the BATTERY connector 
on the left side of the IOTA board. 
10 
Insert the controller module onto IOTA board making sure that the controller 
circuit board mates properly with the IOTA board connector.   
Secure the controller module to the IOTA board with two screws located at 
each side of the plastic cover. 
11 
The controller will boot-up into an ALIVE state or a NODB operating state. 
12 
In Control Builder, perform a ‘Load with Contents’ to the controller.   
 
 
To replace a redundant or secondary controller IOTA 
 
Step Action 
1 
In Control Builder open either the primary or secondary C300 FB and select 
the Redundancy tab.  Click the Disable Synchronization button to set the 
Auto-Synchronization State parameter to "DISABLED." 
2 
On the defective IOTA, loosen the screws at each side of the plastic cover 
that secures the controller module to the IOTA board.  Remove controller 
module from the IOTA board.  
3 
Remove 24 V power to the IOTA board. 
•  Remove the screw from the left side of the IOTA board that connects to the 
24 Vdc bus bar.  
•  Remove the screw from the right side of the IOTA board that connects to 
the GND bus bar. 
4 
Label and disconnect all cables from the IOTA board connectors, (orange 
Redundancy cable, yellow and green FTE cables, gray and violet IOLink 
cables and Battery cable).