SSP North AB
30/08/2018
Manual V2f
75
Input and Output blocks show the current state of the terminals inside the block. If a terminal is in OFF
state, the OFF-state signal background is coloured red. If a pin is in ON state, the ON state signal
square background is coloured green. If a pin is in ERROR state, the middle square will be coloured
orange, and the text ”ERROR” will display.
Online Mode Notice
If online mode does not start, make sure the system is running on the correct channel, and that the
program has been downloaded to all the units in the system. Also check that node 1 is running and
has contact to the other nodes in the system. Downloading or reconfiguring the system again from the
Communication Window can also solve the problem.
Limitations
The status information from nodes in a system is sent periodically, and the update frequency depends
on how many nodes there are in a system. A system with two nodes will therefore have a much faster
update speed of the status information than a system with 16 nodes. This will result in the debug
signals of larger systems updating more slowly than in smaller systems, and in systems of 16 nodes a
delay of a couple of seconds can be seen.
Signals (internally in the unit) that change faster than the update speed of the status information over
radio/USB cannot be seen by Simplifier Manager and will be lost (due to the sampling theorem). This
occurs at a bigger scale in larger systems, due to the longer update time. For example, a quick press
of a push button might not be seen on the online mode, even though the signal was registered
internally in the unit.
Internal logic signals are sent from nodes split into chunks, which means only some are updated at a
time. This can in some rare cases result in some functions looking like they are not behaving correctly.
For example, an AND block could have all inputs green = 1, and the output red = 0. There is nothing
wrong with the AND function, the output signal has just not been updated yet. This will only happen the
instant when a signal in the logic changes and does not happen for signals that have not changed.
Poor radio connection to the node will greatly increase the risk of this happening. To limit this effect, be
close to the systems/nodes that are being monitored.
When using Global Memories in the logic a similar effect can be seen as well. The Global memory
signals are received much faster than the internal signals (since the global memories are taken
directly from the safety information, which has a much higher update frequency). When a Global
Illustration 13.35: Online on a Selector Switch, OSSD Output and a Status Output. The OSSD Output has an external
error on. terminal 4 (short circuit to 24V).
Illustration 13.37: Online mode on a reference to a Global Memory.
