Weidmuller WI-GTWY-9 User Manual page 103

WI-GTWY-9-xxx Wireless Gateway
I/O Register Purpose
4550 - 4689 Message IN Area (i.e. Messages to send to Profibus Interface)
4700 - 4839 Message OUT Area (i.e. Messages from Profibus Interface)
4850 - 4899 Spontaneous Message OUT Area (i.e. Alarm Messages from Profibus)
4900 – 4949 Spontaneous Alarm ACK IN Area (i.e. ACK to above)
For example, a message could be sent to the Profibus Interface by constructing the required
message in the "Message IN Area", either via radio using appropriate block mapping(s) or locally
via a host device or configuration tool. This message is activated upon change-of-state of the
Message ID field (see "Message Structure" above). The Profibus interface may generate a
response to this message in the "Message OUT Area", which may then also be transmitted via
radio using appropriate block mappings or locally via the host device.
Set Slave Mode
SET_SLAVE_MODE: Command Number = 0003h.
In addition to station related user data transfer, which is executed automatically, the master can
send control commands to a single slave, a group of slaves or all slaves simultaneously. These
control commands are transmitted as multicast commands. This permits use of sync and freeze
modes for event controlled synchronization of the slaves.
The slaves begin sync mode when they receive a sync command from their assigned master. The
outputs of all addressed slaves are then frozen in their current state. During subsequent user data
transmissions, the output data are stored at the slaves, but the output states remain unchanged.
The stored output data are not sent to the outputs until the next sync command is received. Sync
mode is concluded with the unsync command.
Similarly, a freeze control command causes the addressed slaves to assume freeze mode. In this
operating mode, the states of the inputs are frozen until the master sends the next freeze
command. Freeze mode is concluded with the unfreeze command.
Note : Not all slaves supports this feature. Consult the documentation for the actual slave for
further information.
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