AK-PI
100
Manual RS8FB102 © Danfoss 03-2008
3
Communication/number of addresses
An AK-PI 100 can be configured for two types of communication
- MDM communication or WTP communication. If both types of
communication are needed in the system, two AK-PI 100 units
must be used.
With MDM communication, up to 160 controllers can be con-
nected to one AK-PI 100.
With WTP communication, up to 128 controllers can be connected
to one AK-PI 100.
In total, the AK-SC 255 can handle up to 162 addresses, including
units connected directly to the system controller.
Addresses
In principle, there are three types of address:
IP addresses
An IP address must be configured for the system controller and for
the AK-PI 100.
The address can be either static or dynamic - the choice is made
by changing a setting. To use a static address, you also need to
configure the address.
If the system is accessed from the outside, the system controller
should always be set to static, so that the external connection
always knows the address and is able to contact the unit.
(The IP is configured using a menu.)
Network addresses
A network must always have one, and only one, unit acting as
master. In this case, the master is AK-SC 255. To specify this, the
address is configured to = 0. This master controls communication
with all other controllers in the network.
A PI unit is handled as a controller in the network, and you can
view its address in the “Channel PI-100/200” screen.
Each PI unit is configured with a different address. You can choose
11, 12 or above, e.g. 21. (Addresses 1 to 10 are reserved for sub-
nets.)
Connection:
When you configure the system controller, the relevant AK-PI 100
is assigned to the network. The system controller then recognises
the link to all the MDM units/WTP units. The check marks in the
screenshot on the right show that contact with PI units has been
selected. One has the address 21 and the other has the address 90
(the numbers 084Z8521 and 22 indicate that there is one PI 200
and one PI 100).
Controller addresses
All controllers in the same network must have different addresses.
This means all controllers connected to a system controller via:
• LON communication
• MOD bus communication
• DANBUSS communication via an AK-PI 200
• MDM communication via an AK-PI 100
• WTP communication via an AK-PI 100
A maximum of 162 controllers can be connected to a system con-
troller. The system controller cannot handle addresses above 199.
The AK-PI 100 has an auxiliary function that can shift a group of
addresses, so that you do not need to change the address in each
individual MDM and WTP unit.
The function is called “address offset”, and informs the AK-SC 255
of the changed addresses. After the function, a unit has the follow-
ing address: Offset value + configured address of the unit.
DANBUSS communication:
Address options 1 to 120
LON communication:
Address options 1 to 199
MOD bus communication:
Address options 1 to 199
MDM communication:
Address options 1 to 199 (255)
WTP communication:
Address options 1 to 199 (248)
AK-SC 255:
Address options 1 to 199
Max. number: 162
