Physical Description of M580 Hot Standby CPUs
Original instructions
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PAC Hot Standby CPU Modules
These M580 CPU modules support M580 Hot Standby systems:
CPU Module Front and Back Views
The three Hot Standby CPU modules have the same external hardware features. The front of the module is on the left. The back of the module is on the right: 
1
LED diagnostic display panel 
2
Mini-B USB port for module configuration via PC running Control Expert 
3
RJ45 Ethernet service port connector 
4
RJ45 connectors that together serve as a dual port to the Ethernet network 
5
SFP socket for copper or fiber-optic Hot Standby link connection 
6
Hot Standby status link LED 
7
SD memory card slot 
8
A/B/Clear rotary selector switch, used to designate the PAC as either PAC A or PAC B, or to clear the existing Control Expert application
NOTE: The only visible difference between safety and non-safety CPUs is that safety CPUs are colored red.
Rotary Selector Switch
Use the rotary switch on the back of each M580 Hot Standby CPU to designate the role that the CPU plays in the M580 Hot Standby configuration:
Use only the small, plastic screwdriver provided with the CPU to set the rotary switch according to its role in a Hot Standby system.
NOTICE
RISK OF UNINTENDED OPERATION
Use only the small, plastic screwdriver that ships with the module to change the rotary switch position. Using a metal screwdriver can damage the switch, rendering it inoperable.
Failure to follow these instructions can result in equipment damage.
Rotary switch settings include:
Position
Result
A
B
  • Designates the PAC as PAC B, as referenced in Control Expert and the T_M_ECPU_HSBY DDDT.
  • Assigns the PAC IP address B on Ethernet RIO network.
Clear
  • Clears the application in the PAC, and places the PAC into the NO_CONF operational state.
  • If an SD memory card is inserted in the PAC, the application in the card is also cleared,
NOTE: Setting the switch for each Hot Standby PAC to the same A/B position can cause a a conflict of PAC roles.
Clearing CPU Memory
To clear a CPU memory, follow these steps:
Step
Action
1
Set the rotary switch to [Clear].
2
Power up the PAC.
3
Power down the PAC.
4
Set the rotary switch to [A] or [B].
When you next power up the PAC, if the remote PAC is primary, the primary PAC transfers the application to the local PAC.
SFP Socket
Each CPU module includes one SFP socket, to which you can connect either a fiber optic or a copper transceiver:
To insert a transceiver:
Step
Action
1
Check that the CPU is powered off.
2
Position the transceiver so that its label is oriented to the left.
3
Press the SFP transceiver firmly into the socket until you feel it snap into place.
NOTE: If the SFP transceiver resists, check the orientation of the transceiver and repeat these steps.
To remove a transceiver:
Step
Action
1
Check that the CPU is powered off.
2
Pull out the latch to unlock the transceiver.
3
Pull on the transceiver to remove it.
NOTICE
POTENTIAL EQUIPMENT DAMAGE
Do not Hot Swap the SFP transceiver. Insert or remove the transceiver only when there is no power to the CPU.
Failure to follow these instructions can result in equipment damage.
NOTE: For part numbers and other information regarding the available transceivers, refer to the description of CPU Hot Standby link transceivers.
Each module comes with a stopper. When the SFP socket is not connected to a transceiver, cover the unused socket with the cover to keep out dust
Grounding Considerations
Follow all local and national safety codes and standards.
DANGER
HAZARD OF ELECTRIC SHOCK
If you cannot prove that the end of a shielded cable is connected to the local ground, the cable must be considered as dangerous and personal protective equipment (PPE) must be worn.
Failure to follow these instructions will result in death or serious injury.