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ifm
Programming Manual BasicController relay CR0431 v03.03.00
05 / 2018
ifm function elements
ifm function elements for the device CR0431
RELAY
19719
Unit type = function block (FB)
Unit is contained in the library
ifm_CR0431_util_Vxxyyzz.LIB
Symbol in CODESYS:
>
Description
19719
The FB RELAY switches the relay of the selected output channel with an adjustable voltage.
Possible use:
• Diagnostics of fuse and relay position
• Operation of 12-V relay on 24 V
• Reduction of the relay holding voltage (reduce energy consumption and heat loss)
Observe the data sheet of the relay used.
Example values for the relay:
rated voltage
24 V
operating voltage
14.4 V
release voltage
3.6 V
REF_VOLTAGE indicates the reference voltage to calculate the threshold values of the status
messages.
If REF_VOLTAGE > 32 000:
• value is not adopted
• error message RESULT = 140.
For the status messages:
the measured voltage ...
the status message STAT-xx ...
exceeds 70 % of the reference voltage
changes to TRUE
falls below 30 % of the reference voltage
changes to FALSE
The status messages indicate only meaningful values if the reference voltage used for calculating the
ON/OFF threshold is > tolerance of the voltage measurement for system voltages.
Bouncing of the relay (e.g. greater than 50 ms) can be visible via the status message. The
status can indicate TRUE and FALSE several times alternately until the relay is in a stable
state.
VOLTAGE = SUPPLY_VOLTAGE_VBBS_SW
– 400 mV
(typical voltage drop on reverse-polarity-protection diode).
If VOLTAGE > (SUPPLY_VOLTAGE_VBBS_SW
– 400 mV):
• output voltage = (SUPPLY_VOLTAGE_VBBS_SW – 400 mV).
If VOLTAGE > 32 000:
• value is not adopted
• error message RESULT = 140.
If VALUE = TRUE:
Relay indicates the voltage value in the parameter VOLTAGE (max. VBBs if it can be reached) on the
Summary of Contents for BasicController CR0431
Page 228: ...228 10 Notizen Notes Notes...
