Siemens SIMATIC S7-300 FM 350-1 - Page 154

Operating Modes, parameters and commands
7.4 Measuring modes
FM 350-1 Counter module
154 Manual, 05/2011, A5E03648639-01
Behavior of the Digital Outputs
Digital output DO0
For digital output DO0, you can set 4 possible reactions to reaching the limit values. The
various options are shown in the table below.
Table 7- 44 Behavior of Digital Output DO0
Switching time
Parameterization of
Digital output DO0
Behavior of Digital output DO0
Isochronous mode Non-isochronous
mode
No comparison Not affected by the monitoring of limit values.
If Output DO0 is already set, it can be reset by
changing the parameter to "No comparison".
You can use Output DO0 freely as a digital output
and set and reset it with the control signal SET_DO0
if you have enabled it with the control signal
CTRL_DO0.
To point in time T
o
. Immediately after
setting or resetting
the output
Out of limits DO0 is set in both of the following cases:
 Measured value < Lower limit
 Measured value > Upper limit
Below the low limit DO0 is set if
 Measured value < Lower limit
Above the high limit DO0 is set if
 Measured value > Upper limit
At the end of the
update time at time
T
i
At the end of the
update time
Digital output DO1
You can use Output DO1 freely as a digital output and set and reset it with the control signal
SET_DO1, provided that it has been enabled.
DO1 is not affected by limit value monitoring.
In non-isochronous mode, DO1 switches immediately after the output is set or reset.
In isochronous mode, DO1 switches at the end of the update time at time T
o
.