Copyright © Siemens AG 2016. All rights reserved
276
ERTEC 200P-2 Manual
Technical data subject to change
Version 1.0
DIS_RLD_WHEN
_WR_LDREG
Function
0
Writing a load value on the load register has the ef-
fect that the load value is taken over into the counter
with the next counter edge or the next gate/trigger
signal (depending on the setting in the mode registe).
1
Writing a load value on the load register has the effect that the
load value is taken over into the counter under the following
conditions
The counter has reached the value ’0’
Bit Reload_disable in the mode register is ’1’
If these conditions are met, the takeover is carried out with the
next counter edge or the next gate/trigger signal (depending on
the setting in the mode register).
By setting the DIS_RLD_WHEN_WR_LDREG bit to 1, the takeover of the load register
value is only possible during the zero crossing. This function is required to use the timers
as phase-shifted cyclic timers.
One of the two input signals
EXT_GATE_TRIG
or
INT_GATE_TRIG
can be used:
as gate signal for releasing/blocking the counter, or
as trigger signal for triggering the counter, or
as clock signal for clocking the counter.
The selection of the external gate/trigger signal is done by the mode register bit
Ext_gate_trig_enable in accordance with the following table:
Ext_gate_trig_enable
Function
0
INT_GATE_TRIG = internal gate/trigger signal
1
EXT_GATE_TRIG = external gate/trigger signal
Differentiation between INT_GATE_TRIG and EXT_GATE_TRIG (internal and external
gate/trigger signal):
INT_GATE_TRIG is triggered by the software
EXT_GATE_TRIG is triggered by an external hardware signal.
The
Gate_polarity bit
defines the active level or the active edge of the external
gate/trigger signal in accordance with the following table:
Gate_polarity
Function
0
Level of the external gate/trigger signal is “high active” or rising
edge is active edge
1
Level of the external gate/trigger signal is “low active” or falling
edge is active edge
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