Siemens SINUMERIK 880 SW 6 Planning Manual page 223

05.91
DYNAMIC M SIGNALS
Like the static signal bits, the dynamic M signal bits are set by decoded M functions, but they
remain at "1" for only one PLC cycle and are then reset by the PLC operating system. Up to
three dynamic signals can be output per PLC cycle and channel.
Example of application:
To switch on coolant by statically scanning a static M signal.
To switch off coolant by resetting the static M signal with a dynamic M signal.
1
2
3
Signal chart
1: M modification signal
2: Dynamic M signal
3: Static M signal (coolant ON)
4: Static M signal set
5: Static M signal reset by dynamic M signal by the user program within one PLC cycle
(t = PLC cycle time)
c
M WORD 1, M WORD 2, M WORD 3
EXTENDED ADDRESS M WORD 1 TO 3
Up to three M functions programmed in one NC block are made available at the same time as
soon as the M modification signals are available.
Format: Fixed-point number, value range 0 to 9999
Extended address: Fixed-point number, value range 0 to 99
Note:
With the functions M3, M4, M5 and M19, the spindle referred to by the M function is
addressed by means of the extended address. Otherwise it is generally recommended to relate
the M function to a specific channel by means of the extended address.
Example of application:
Decoding or evaluation of M functions that are not decoded as standard or according to the
list.
©
Siemens AG 1991 All Rights Reserved
SINUMERIK 880 (PJ)
6 NC Channel/PLC Interface (DB 10 ... DB 25)
t
c
4
6ZB5 410-0HE02
6.6.3 Description of information signals
DL 18 to DL 30
5
DW 32, 34, 36
DW 31, 33, 35
6
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