User manual

Chapter 4 Configuration
Page 53 ©February 2009
4.4.4 Startup Polls
You can enter start up polls for remote modules by using the “New Poll Mapping” box. This
function is the same as for the 105U I/O modules. A start-up poll is a special message sent when
the 105G starts up. When the remote module receives a start-up poll, it will immediately
respond with update messages for all its inputs that are mapped to the 105G. This allows the
105G to have correct values on start-up.
4.4.5 Polls to Remote Modules
It is possible for a 105G to send a poll to a remote module at other times apart from start-up. A
poll can be sent under the following events:
• based on a configurable time period
• based on real time clock
• on-demand by the host device.
For information on this configuration, refer to the next section on “Block Mappings”.
4.5 Mappings from 105G to other 105G Modules
Individual links between 105G modules can be configured under the “Mappings” selection as
described in the previous section. For example, if you want to transfer I/O Reg 144 in 105G#2
to I/O Reg 286 in 105G #3, you can enter the following mapping:
Whenever I/O Reg 144 changed by the sensitivity amount, 105G#2 would send a message to
105G#3 to write the value in I/O Reg 286. The problem arises if there are a lot of these
mappings. Each radio message only relates to one register-register link. If you want to map
1000 registers from one 105G to another, then this could generate a lot of radio messages.
To get around this problem, it is possible to configure “block mappings”. With a block mapping,
multiple registers (a “block of registers”) can be transferred together in the one radio message.
This improves the efficiency of the radio communications.