Siemens SINUMERIK 880 SW 6 Planning Manual page 53

01.93
Conditions
• Interrupt processing is possible only if the PLC is operated in the special mode. Special
mode is set in PLC MD 6051, bit 0.
• One PLC can process a total of 3 or 4
generating signals. The 3 interrupt bytes are distributed between the available EU-MPC or
DMP interfaces. One interrupt byte can be defined per interface. On the GA2 with free
configuration, the four interrupt bytes are assigned in a configuration DB.
• No expansion unit is allowed in a DMP line in which an interrupt byte is declared because
the cycle times for the other DMP submodules in the line are extended from approx. 5 ms
to approx. 10 ms by the EU.
• If the interrupt byte is an input byte on a DMP module with 16 inputs/16 outputs, the first
output byte of the DMP submodule is also updated with each scan of the interrupt byte
(high-speed output channel). The reaction time from a signal change in the interrupt byte
to setting an output in the first output byte is approx. 2.5 to 5 ms (typical: 3 ms).
Interrupt-generating signal edge
(1)
(2)
(3)
(4)
Typical interrupt-controlled reaction with 16 input/16 output DMP submodule
(1) Input signal
(2) OB 2 processes the interrupt and reacts by setting an output signal in the output image.
(3) Image of an output in the first output byte of the DMP submodule
(4) The output is switched according to the output image.
_______
d) with GA2, software version 1 and higher with free configuration
© Siemens AG 1991 All Rights Reserved
SINUMERIK 880 (PJ)
d)
interrupt bytes, equivalent to 24 or 32
OB 2 processes
interrupt
Output image
approx. 2.5 to 5 ms
6ZB5 410-0HE02
1 General Overview
1.4.3 Interrupt-generating I/O devices
d)
interrupt-
Output in first
output byte of
DMP submodule
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