Handling The Slot Parameter (Control Interface) - Siemens Simatic S7-1500 Manual

Technology functions
3.2 Pulse generators
3.2.3.2

Handling the SLOT parameter (control interface)

SLOT and MODE_SLOT
SLOT has the following operating modes.
● Mode for individual update (MODE_SLOT = 0)
Use this mode if you occasionally change the specific parameters (such as period
duration) before the start of the output sequence or during operation.
– The value in SLOT is the always applied when the value changes in LD_SLOT.
– The acknowledgment bit STS_LD_SLOT in the feedback interface is switched.
– The value of LD_SLOT defines the interpretation of SLOT (see the table below
– If the LD_SLOT value is invalid, the setting of the feedback bit ERR_LD indicates a
– Changes made in this mode can be read back by the channel in the parameter
– The current changes are entered in the data record 128 during the reading back of the
● Mode for cyclic updating (MODE_SLOT = 1)
Use this operating mode if the program is to continuously control another parameter in
addition to the main parameter to be controlled.
– The value in SLOT is transferred with each module cycle.
– No acknowledgment bit is available.
– The value of LD_SLOT defines the interpretation of SLOT (see the table below
– If the value in SLOT is not valid, the error ERR_SLOT_VAL occurs. The error is
– In this mode the value in the parameter assignment data record is not updated. If
– The mode for permanent updating can be stopped by setting LD_SLOT to 0 and
64
"Interpretation of the SLOT parameter value").
parameter assignment error. The user has to reset the error using the control bit
RES_ERROR and enable the SLOT parameter again for the next value.
assignment data record.
parameter assignment data with RDREC from the user program. These changes are
lost during a warm restart of the CPU.
"Interpretation of the SLOT parameter value").
automatically reset as soon as a valid value is loaded.
LD_SLOT is changed in this mode, the last value applied from LD_SLOT is valid.
MODE_SLOT to 0. By stopping the mode for permanent updating the changes made
at the parameters during the permanent updating are retained until the next changes
via SLOT (cyclic or once) or until the next STOP-RUN transition.
CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Manual, 09/2016, A5E35306440-AB