IMAC2B009 V2
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iMAC System User Manual
iMAC2B009 V4
– 10/18
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Local and Global Data
An iMAC fieldbus address can be configured as LOCAL or GLOBAL. If the address is local, it is not passed
around the network. A local address is only available at the Controller to which the module is connected.
To output local data, the output module must be connected to the same communication line as the local
address. Local data can only be displayed on the Controller driving the L1 fieldbus to which the local
modules are connected.
If the address is global it is passed throughout the network. A global address can have only one owner
(input module or Controller) within the whole network. But a global address can be output in many places
across the network.
Usually each Controller within a network has a range of local addresses, which are used for local monitoring
and control. The results, or summary, of the monitoring information is published into a range of global
addresses for display and control at other Controllers.
Sequence Control
The iMAC System provides four specialised control bits for sequence control. These are generally used for
conveyor sequence control, but can be re-purposed for other applications. The sequence control bits are
called:
L1 Sequence Down Bit
L1 Sequence Up Bit
L2 Sequence Up Bit
L2 Sequence Down Bit
The “L1 Sequence Down Bit” and the “L2 Sequence Up Bit” are used by the iMAC2 Controller to initiate
downstream and upstream sequenced starts (respectively). These bits can be set and cleared by the
Controller’s application (SLP) software. This is in contrast to the “L1 Sequence Up Bit” and the “L2
Sequence Down Bit” which are read only. These bits are set by other Controllers in the iMAC Network.
The “L1 Sequence Down Bit” is transmitted from the iMAC2 Controller’s L1 fieldbus port. Any iMAC2
Controller
’s that are networked with this Controller, via their L2 fieldbus ports, will receive this bit and store it
as the “L2 Sequence Down Bit”.
The “L2 Sequence Up Bit” is transmitted from the iMAC2 Controller’s L2 fieldbus port. The upstream iMAC2
Controller
in the network will receive this bit and store it as the “L1 Sequence Up Bit”.
The Controller’s application (SLP) software can be customised to affect conveyor control via these
sequence bits, Figure 4.3 and Figure 4.4 show typical upstream and downstream examples.
