Siemens SINUMERIK 840C - Manual (Page 555)

7 Drive Machine Data (SIMODRIVE Drive MD) 09.95
7.3.2 Drive MD (data description)
Value table:
Bit 0 Variable message function 0 = not active
1 = active
Bit 1 Segment variable message function 0 = address space X
1 = address space Y
Bit 2 Comparison variable message function 0 = comparison without sign
1 = comparison with sign
Note:
Bit 1 is effective only if signal number 0 is selected in MD 1621 (signal number variable
message function).
The variable message function monitors a freely selectable memory location from address
space X or Y in the data RAM for violation of a threshold specified by the user. A tolerance
band can also be set for this threshold value which is taken into account when the threshold is
scanned for violation. This message is output via operational message with bit 5 and can be
linked to a pickup or dropout delay. The message function is executed in a 4 ms cycle.
Graphic representation
Threshold Tolerance band
Pickup delay time Dropout delay time
Message
t
Note:
The quantity to be monitored can be selected by specifying either a signal number or a
physical address; the physical address, however, is relevant only for Siemens servicing
purposes.
7–140 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)