Siemens Simatic S7-1500 Manual page 66

Technology functions
3.2 Pulse generators
Note that the following requirements apply to the representation shown above:
●
●
● The error must be acknowledged
If MODE_SLOT 0 = 1, the following applies (for PWM mode only):
● The value in SLOT is continuously evaluated according to LD_SLOT
● STS_LD_SLOT does not change
● An error is automatically reset as soon as a valid value is set in SLOT
Cyclic updating of the parameter 'Period duration'
The following representation illustrates the execution of the cyclic updating of the parameter
'Period duration'. The described workflow principle can also be used on the channels of the
high-speed counters.
①
User sets SLOT to the required parameter
•
User sets MODE_SLOT to 1
•
User sets LD_SLOT to the required value (1 for period duration)
•
②
User changes value in SLOT continuously and technology channel evaluates continuously
③
Value in SLOT exceeds permitted limit, technology channel shows this ERR_SLOT_VAL and continues working
with the last valid value
④
Value in SLOT again in permitted range, technology channel resets ERR_SLOT_VAL independently and continues
working with the value in SLOT
⑤
User resets LD_SLOT and MODE_SLOT, technology channel continues to work with last value
Figure 3-5 Cyclic updating
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The value MODE_SLOT must be set to 0
Errors or invalid values are shown in the feedback bit ERR_SLOT_VAL
CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Manual, 09/2016, A5E35306440-AB