Limit Value Switch - Siemens Simatic RTU303xC Series Operating Instructions Manual

Parameters
Trigger
Input
Function parameters
Positive change
Negative change
Output parameters
Output
5.7.3

Limit value switch

Function
An analog input is monitored for two values and a digital output signal is set that depends on
the function of the block.
RTU303xC
Operating Instructions, 06/2019, C79000-G8976-C382-06
Tag type / range of Description
values
True / False With an edge change 0 → 1 block processing is started (if
En = 1) and the current value of the analog input (A
Digital input / output /
saved.
bit memory
With the setting "True" the trigger is always active.
STATUS_ERROR
With the setting "False" the block is never processed.
Analog input / bit The value (A
memory change of "Trigger" is monitored by the block function for
positive and negative change.
Event counter / usage
meter
3.402823 e-38 .. Absolute value of the positive change (Δ+)
3.402823 e+38
Max. 19 characters,
display of max. 4
decimal places
3.402823 e-38 .. Absolute value of the negative change (Δ-)
3.402823 e+38
Max. 19 characters,
display of max. 4
decimal places
Digital output / bit Tag in which the value calculated by the block is output:
memory
•
•
5.7 Blocks for analog value functions
) of the input at the time of the edge
Trg
1 = "Positive change" overshot or "Negative change "
undershot
0 = "Positive change" not overshot and "Negative
change " not undershot
Program blocks
) is
Trg
281