Siemens SIMATIC ET 200SP HA User Manual

6.11 Calculation of the remaining supply voltage at the sensor
To ensure the function of the connected sensor, the remaining supply voltage U
min
must be
greater than/equal to the minimum supply voltage of the sensor.
To calculate the remaining supply voltage on the sensor, determine the following voltages
depending on the wiring scheme used:
• Determine the minimum supply voltage (UV
min
):
Power supply unit e.g. for SITOP 24 V ± 2%
UV
min
= UV – [Tolerance] = 24 V – 2% = 23.5 V
(Voltage drop on the supply line to the I/O module was neglected).
• Calculate the maximum voltage drop on the signal line (U
line
):
For example, for copper cable 500 m with ∅ = 0.5 mm²; at I
max
= 25 mA
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U
line
= 35.7 Ω × 25 mA = 0.9 V
• Calculate the voltage drop (U
Ri
) at the input resistance "Ri" of the I/O module:
– With Ri
max
= 150 Ω; at I
max
= 25 mA
U
Ri
= 150 Ω × 25 mA = 3.8 V
– In a high-availability application case, the voltage of the Z diodes used in the redundant
terminal block (U
Z
= 6.2 V) must also be considered with a tolerance of 5%.
U
Z_6V2
= U
Z
+ Tolerance = 6.2 V + 5% = 6.5 V
• Determine the voltage drop at the sensor supply U
sensor supply
:
U
sensor supply
= 1.2 V
Calculation examples
Example for the calculation of the remaining supply voltage (U
min
) on a 2-wire transmitter in an
application case with no high-availability:
• U
min
= UV
min
– U
line
– U
Ri
– U
sensor supply
• U
min
= 23.5 V – 0.9 V – 3.8 V – 1.2 V = 17.6 V
Example for the calculation of the remaining supply voltage (U
min
) on a 2-wire transmitter in an
application case with high availability:
• U
min
= UV
min
– U
line
– U
Z_6V2
– U
Ri
– U
sensor supply
• U
min
= 23.5 V – 0.9 V – 6.5 V – 3.8 V – 1.2 V = 11.1 V
Applications of the F-I/O module
6.11 Calculation of the remaining supply voltage at the sensor
F-AI 8xI 2-/4-wire HART HA
60 Equipment Manual, 09/2021, A5E50557845-AA

Siemens SIMATIC ET 200SP HA Specifications

General

Category	I/O Systems
System	SIMATIC ET 200SP HA
Mounting	DIN rail
Protection Rating	IP20
Communication Protocol	PROFINET
Redundancy	Yes
Hot Swapping	Yes
Modularity	Modular
Power Supply	24 V DC
Temperature Range	-40 to 70 °C
Product Type	Distributed I/O
Number of I/O modules	Up to 64
Redundancy Type	system redundancy
Operating Temperature	-40 to 70 °C
Storage Temperature	-40 to 70 °C
Relative Humidity	5% to 95% (non-condensing)
Vibration Resistance	IEC 60068-2-6
Shock Resistance	According to IEC 60068-2-27
Mounting Type	DIN rail

Summary

Security information

Product overview

Properties of I/O module

Details the properties and features of the F-AI 8xI 2-/4-wire HART HA I/O module.

Parameters/address space

Module/channel parameters

Details module/channel specific parameters affecting module or channel configuration.

Explanation of the module/channel parameters

Provides detailed explanations for key module and channel parameters.

Address space

Details the allocation of input and output address space for the I/O module.

Applications of the F-I/O module

Application case 1: SIL3/Cat.3/PLd, 2-wire transmitter, 1oo1

Details wiring and parameter assignment for SIL3/Cat.3/PLd, 2-wire transmitter, 1oo1 application.

Application case 1a: SIL3/Cat.3/PLd, 2-wire transmitter, 1oo1 (high availability)

Details wiring and parameter assignment for redundant SIL3/Cat.3/PLd, 2-wire transmitter, 1oo1.

Application case 2: SIL3/Cat.3/PLd, 4-wire transducer, 1oo1

Details wiring and parameter assignment for SIL3/Cat.3/PLd, 4-wire transducer, 1oo1 application.

Application case 2a: SIL3/Cat.3/PLd, 4-wire transmitter, 1oo1 (high availability)

Details wiring and parameter assignment for redundant SIL3/Cat.3/PLd, 4-wire transmitter, 1oo1.

Application case 3: SIL3/Cat.4/PLe, 2- or 4-wire transducer, 1oo2

Details wiring and parameter assignment for SIL3/Cat.4/PLe, 2/4-wire transducer, 1oo2 application.

Application case 3a: SIL3/Cat.4/PLe, 2- or 4-wire transmitter, 1oo2 (high availability)

Application case 4: SIL3/Cat.4/PLe, 2- or 4-wire transmitter, 2oo3

Requirements placed on sensors for fail-safe modules

Outlines specific requirements for sensors used in fail-safe applications.

IO redundancy

Displays, alarms and messages

Interrupts

Diagnostic messages

Explains diagnostic messages, their meanings, causes, and possible remedies.

Maintenance events

HART function

HART system connection

Communication

Technical specifications

Technical specifications

Provides detailed technical data, electrical specifications, and environmental conditions.