Synergy modules and remote stations must have unique addresses within the system. Modules may not share addresses with each other, but may share addresses with a station (as they are addressed seperately).
For example, a small Synergy enclosure with an SYPMB 6D dimming module and an SYPM 8L relay module might have the first set to address 1 and the second to address 2. To set the address on these stations, use the rotary dial, which is located on the top circuit board on the 6D module and right above the ribbon cable landing on the 8L module.
Synergy uses "hotel" addressing - the address of the module is the "floor" of the "hotel", and the individual relays on the module are the "rooms". Just as in a hotel, we take the floor number multiplied by 100, and add the room number, to get the relay's address. So on our 8L module above, which is set to address 2, the relays are numbered 201, 202, 203, 204, 205, 206, 207, and 208. Likewise, on our 6D (which has 6 relays), the address of the relays are 101, 102, 103, 104, 105, and 106.
On a relay module such as the 8L, there is a group for each relay that shares the same address as the relay - group 201 controls relay 201, group 202 relay 202, and so forth. There is also a group created that controls all the relays on the module - it is "room" 17, or in this example, group 217. A command sent to group 217 will affect all the relays on that module.
On a dimmer module such as the 6D, a total of five groups are created by default, with each controlling a different grouping of the module's relays. In our example, these groups would be 101, 102, 117, 118, and 119. Group 101 controls three relays: Relays 101, 102, and 103. Group 102 controls relays 104, 105, and 106. Group 117, relays 101 and 102. Group 118, relays 103 and 104. Group 119, relays 105 and 106.
Last, there is a default group 0000, which is a global group and controls all of the relays and dimmers in the cabinet.