The textual language used in transition conditions is equivalent to the expression (expr) in the actions grammar with the exception that the additional unary prefix operators / and \ are available.
Rising Edge Detection
The expression '/'expr is true if the expression is true in the current scan cycle and was false in the previous scan cycle. expr may only refer to a digital input or a Boolean Variable with an update expression.
Falling Edge Detection
The expression '\'expr is true if the expression is false in the current scan cycle and was false in the previous scan cycle. expr may only refer to a digital input or a Boolean Variable with an update expression.
CCOM Message Arrival
The expression '/'id is true if an incoming CCOM message has arrived and has been decoded into the XML Message In structure id.
DPWS Eventing
The expression '/'obj is true if the DPWS Object obj has any events.