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Order-No. 7574 00 1X<br />
picture 13: Telegram structure of collective feedback<br />
It is possible to show up to 16 different switching states logically in a telegram. In so doing, each<br />
output possesses a bit, which signals the switching state ("S bit), and an additional bit, which<br />
defines the masking ("M" bit). The "S" bits correspond to the logical switching states of the outputs<br />
and are either "1" (switched on) or "0" (switched off). The "M" bits are "1" when the actuator<br />
possesses this output. In the same way, the "M" bits are "0" when the appropriate output is not<br />
available on the actuator. In the latter case, the corresponding "S" bits are continuously "0" as<br />
there is no switching state.<br />
Example: with a 16x switching actuator, all the 16 M bits are set in a telegram as this actuator<br />
possesses all the channels which can be shown in the collective feedback. By contrast, with an<br />
8x actuator only the first lower 8 M bits (byte 3) are set, as this actuator only possesses 8 channels.<br />
The top 8 M bits (byte 4) are thus set to "0" in the collective feedback telegram. For actuators<br />
with a different amount of channels, the number of M bits behaves in the same way.<br />
The panel can display the switching state of one actuator channel of the collective feedback in a<br />
display element. The channel of the collective feedback which is then evaluated is determined<br />
by the "Channel to be evaluated" parameter (1...16) in the parameter group of the appropriate<br />
display element. The display element only evaluates the specified channel in the collective feedback<br />
telegram, i.e. it inserts the appropriate M bit and S bit .<br />
picture 14: M bit and S bit of a display element to be evaluated<br />
Software "...590101"<br />
Functional description<br />
Only when the read-in M bit is set in the telegram, i.e. the channel is available on the actuator,<br />
does the panel evaluate the corresponding S bit and displays the status 'On' or 'Off' in the display<br />
element. Either image texts or status icons can be displayed as text or an icon, according<br />
to the status display.<br />
If the M bit of the channel to be evaluated is not set in the collective feedback telegram, i.e. the<br />
appropriate actuator channel does exit, then the panel displays the status 'Invalid' in the display<br />
element. This is a case of bad programming.<br />
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