SIEMENS S7-300 FM 355-2 temperature controller module

FM 355-2 temperature controller module
Overview

  • 4-channel closed-loop controller module specifically for temperature controls
  • Including integrated and easy-to-use online self-optimization
  • Heating and cooling controllers as well as combined controllers with heating and active cooling function feasible
  • Ready-to-use controller structures
  • 2 versions:
    • FM 355-2 C as a continuous controller;
    • FM 355-2 S as step or pulse controllers
  • With 4 analog outputs (FM 355-2 C) or 8 digital inputs (FM 355-2 S) to directly control the most common final control elements
  • Continuation of control mode also possible with CPU stop or failure
Application

The FM 355-2 closed-loop control module is the intelligent 4-channel temperature control module.

It can be used, for example, in the following sectors:

  • General mechanical engineering
  • Plant engineering
  • Industrial furnaces
  • Cooling and heating apparatus
  • Food and drinks industry
  • Rubber and plastics machines
  • Chemical and process industries
  • Glass and ceramics industry

The FM 355-2 is available in two versions:

  • FM 355-2 C:
    As a continuous controller with 4 analog outputs for driving analog actuators
  • FM 355-2 S:
    As step-action or pulse controller with 8 digital outputs for driving motor-driven (integrating) or binary-driven (electric strip-type heaters and cartridges) actuators.

The FM 355-2 can be used in SIMATIC S7-300 and ET 200M with S7-300/-400 as a DP master.

Design

  • User-friendly wiring;
    Encoders and actuators are connected via two separate 20-pin front connectors.
  • LEDs:
    Red fault LED (group fault);
    green LEDs for indicating the status of the digital inputs;
    yellow LED for indicating backup operation
  • High-performance measured data acquisition:
    The module has 4 analog inputs for analog value acquisition and disturbance variable input as well as 1 additional analog input for temperature compensation when used with thermocouples.
  • Various encoders can be used:
    Thermocouples, Pt 100, voltage encoders, current encoders.
  • Extensive I/O:
    • FM 355-2 C:
      4 analog outputs for analog final control elements;
    • FM 355-2 S:
      8 digital outputs for motorized actuators or binary controlled actuators.
      The 24 V DC supply for the actuators is applied externally.
  • Resolution and accuracy:
    The A-to-D conversion has 14-bit resolution and greater accuracy than in the case of FM 355.
    This is an advantage especially when using thermocouples.

Configuring package

The configuring package supplied on CD contains:

  • Standard function blocks for exchanging data with the CPU
  • Parameterization screen forms
  • Getting Started – A short guide to startup
  • Manual
Product No. / Product Description Ordering data
6ES7355-2CH00-0AE0
SIMATIC S7-300, TEMPERATURE CONTROL MODULE FM 355-2 C, 4 CHANNELS, CONTIN. 4 AI + 8 DI + 4 AO INCL. MULTI-LANG CONFIG. PACK., MANUAL AND GETTING STARTED (GER/EN/IT) ON CD-ROM
6ES7355-2SH00-0AE0
SIMATIC S7-300, TEMPERATURE CONTROL MODULE FM 355 S, 4 CHANNELS, STEP AND PULSE, 4 AI + 8 DI + 8 DO INCL. MULTI-LANG CONFIG. PACK., MANUAL AND GETTING STARTED (GER/EN/IT) ON CD-ROM
Function

The FM 355-2 has 4 mutually disconnected closed-loop control channels. The controllers display the following features:

  • Standard control structures (depending on the control structure selected, a number of different types of control may be interconnected in a single structure:
    • Fixed setpoint control,
    • Cascade control,
    • Ratio control,
    • 3-component control.
  • Choice of modes:
    Automatic, manual, safety mode, follow-up mode and backup mode.
  • Sampling interval:
    100 ms to 500 ms (depending on the number of enabled analog inputs)
  • PID algorithm
  • Integrated online self-optimization:
    The self-optimization function is stored on the module and can be executed without the configuration tool, e.g., via an operator panel. The new optimization algorithm can also be started from an almost stationary state (the temperature approaches a stationary state asymptotically). It is not necessary to wait until a warmed up process has cooled down to the ambient temperature. The PID parameters are available as soon as the turning point of the step response is reached. This causes the operating point to be achieved more rapidly.
  • Stepless distribution of the P component onto the reference branch and feedback branch:
    Stepless distribution supports precisely proportioned reduction of the effect of the P component in the case of setpoint step changes and therefore an optimum control response.
  • Adjustable control zone:
    The controller has an adjustable control zone. If the actual value is located within the control zone, the controller will operate in closed-loop control mode. To ensure that the operating point is achieved quickly, when the actual value lies outside the closed-loop control zone, automatic switchover to open-loop control takes place, whereby the maximum setting for heating or cooling is used.
  • Backup mode:
    In the event of CPU failure or CPU Stop, the controller can continue to operate independently. The “backup mode” function is used to set a parameterizable safety setpoint or a parameterizable safety control variable.
  • Disturbance variable input:
    The analog inputs can be used for feedforward compensation in addition to actual value acquisition, if desired.
  • Temperature compensation:
    When thermocouples are used, temperature compensation is possible using an:

    • Integrated temperature sensor
    • External Pt 100
    • Parameterized comparison temperature

Parameterization

A configuration package is supplied with the FM 355-2 that contains all the parameter screen forms that are required for parameterization and startup.

Detailed online Help is available for all screen forms. The parameterization screen forms are called up from STEP 7 following installation.

Technical specifications

Article number

6ES7355-2CH00-0AE0

6ES7355-2SH00-0AE0

TEMPERATURE CONTROL MOD. FM355-2C

SIMATIC S7-300, TEMPERATURE

Supply voltage

Load voltage L+

  • ● Rated value (DC)

24 V

24 V

  • ● permissible range, lower limit (DC)

20.4 V

20.4 V

  • ● permissible range, upper limit (DC)

28.8 V

28.8 V

Input current

from load voltage L+ (without load), max.

310 mA; Typ. 260 mA

270 mA; typ. 220 mA

from backplane bus 5 V DC, max.

75 mA; typ. 50 mA

75 mA; typ. 50 mA

Power loss

Power loss, typ.

6.5 W

5.5 W

Power loss, max.

7.8 W

6.9 W

Digital inputs

Number of digital inputs

8

8

Input characteristic curve in accordance with IEC 61131, type 2

Yes

Yes

Input voltage

  • ● Rated value (DC)

24 V

24 V

  • ● for signal “0”

-3 to +5V

-3 to +5V

  • ● for signal “1”

13 to 30V

13 to 30V

Input current

  • ● for signal “1”, typ.

7 mA

7 mA

Cable length

  • ● shielded, max.

1 000 m

1 000 m

  • ● unshielded, max.

600 m

600 m

Digital outputs

Number of digital outputs

8

Short-circuit protection

Yes; Electronic

Limitation of inductive shutdown voltage to

L+ (-1.5 V)

Controlling a digital input

Yes

Switching capacity of the outputs

  • ● on lamp load, max.

5 W

Load resistance range

  • ● lower limit

240 Ω

  • ● upper limit

4 kΩ

Output voltage

  • ● for signal “1”, min.

L+ (-2.5 V)

Output current

  • ● for signal “1” rated value

0.1 A

  • ● for signal “1” permissible range for 0 to 60 °C, min.

5 mA

  • ● for signal “1” permissible range for 0 to 60 °C, max.

150 mA

  • ● for signal “0” residual current, max.

0.5 mA

Parallel switching of two outputs

  • ● for logic links

Yes

Switching frequency

  • ● with resistive load, max.

100 Hz

  • ● with inductive load, max.

0.5 Hz

  • ● on lamp load, max.

100 Hz

Total current of the outputs (per group)

all mounting positions

  • — up to 60 °C, max.

400 mA

Cable length

  • ● shielded, max.

1 000 m

  • ● unshielded, max.

600 m

Analog inputs

Number of analog inputs

4

4

permissible input voltage for voltage input (destruction limit), max.

20 V

20 V

permissible input current for current input (destruction limit), max.

40 mA

40 mA

Input ranges

  • ● Voltage

Yes

Yes

  • ● Current

Yes

Yes

  • ● Thermocouple

Yes

Yes

  • ● Resistance thermometer

Yes

Yes

Input ranges (rated values), voltages

  • ● 0 to +10 V

Yes

Yes

  • ● Input resistance (0 to 10 V)

100 kΩ

100 kΩ

  • ● -1.75 V to +11.75 V

Yes

Yes

  • ● Input resistance (-1.75 V to +11.75 V)

100 kΩ

100 kΩ

Input ranges (rated values), currents

  • ● 0 to 20 mA

Yes

Yes

  • ● Input resistance (0 to 20 mA)

50 Ω

50 Ω

  • ● 0 to 23.5 mA

Yes

Yes

  • ● Input resistance (0 to 23.5 mA)

50 Ω

50 Ω

  • ● -3.5 mA to +23.5 mA

Yes

Yes

  • ● Input resistance (-3.5 mA to +23.5 mA)

50 Ω

50 Ω

  • ● 4 mA to 20 mA

Yes

Yes

  • ● Input resistance (4 mA to 20 mA)

50 Ω

50 Ω

Input ranges (rated values), thermocouples

  • ● Type B

Yes

Yes

  • ● Input resistance (Type B)

10 MΩ

10 MΩ

  • ● Type E

Yes

Yes

  • ● Input resistance (Type E)

10 MΩ

10 MΩ

  • ● Type J

Yes

Yes

  • ● Input resistance (type J)

10 MΩ

10 MΩ

  • ● Type K

Yes

Yes

  • ● Input resistance (Type K)

10 MΩ

10 MΩ

  • ● Type R

Yes

Yes

  • ● Input resistance (Type R)

10 MΩ

10 MΩ

  • ● Type S

Yes

Yes

  • ● Input resistance (Type S)

10 MΩ

10 MΩ

Input ranges (rated values), resistance thermometer

  • ● Pt 100

Yes

Yes

  • ● Input resistance (Pt 100)

10 MΩ

10 MΩ

Thermocouple (TC)

Temperature compensation

  • — internal temperature compensation

Yes

Yes

  • — external temperature compensation with Pt100

Yes

Yes

Characteristic linearization

  • ● parameterizable

Yes

Yes

  • — for thermocouples

Type B, E, J, K, R, S

Type B, E, J, K, R, S

  • — for resistance thermometer

Pt100 (standard)

Pt100 (standard)

Cable length

  • ● shielded, max.

200 m; 50 m at 80 mV and thermocouples

200 m; 50 m at 80 mV and thermocouples

Analog outputs

Number of analog outputs

4

Voltage output, short-circuit protection

Yes

Voltage output, short-circuit current, max.

25 mA

Current output, no-load voltage, max.

18 V

Output ranges, voltage

  • ● 0 to 10 V

Yes

  • ● -10 V to +10 V

Yes

Output ranges, current

  • ● 0 to 20 mA

Yes

  • ● 4 mA to 20 mA

Yes

Connection of actuators

  • ● for voltage output two-wire connection

Yes

  • ● for current output two-wire connection

Yes

Load impedance (in rated range of output)

  • ● with voltage outputs, min.

1 kΩ

  • ● with voltage outputs, capacitive load, max.

1 µF

  • ● with current outputs, max.

500 Ω

  • ● with current outputs, inductive load, max.

1 mH

Cable length

  • ● shielded, max.

200 m; 50 m at 80 mV and thermocouples

Analog value generation for the inputs

Measurement principle

integrating

integrating

Integration and conversion time/resolution per channel

  • ● Resolution with overrange (bit including sign), max.

14 bit

14 bit

  • ● Conversion time (per channel)

100 ms; At 50/60 Hz

100 ms; At 50/60 Hz

Analog value generation for the outputs

Settling time

  • ● for resistive load

0.1 ms

  • ● for capacitive load

3.3 ms

  • ● for inductive load

0.5 ms

Encoder

Connection of signal encoders

  • ● for voltage measurement

Yes

Yes

  • ● for current measurement as 4-wire transducer

Yes

Yes

Connectable encoders

  • ● 2-wire sensor

Yes

Yes

  • — permissible quiescent current (2-wire sensor), max.

1.5 mA

1.5 mA

Errors/accuracies

Linearity error (relative to input range), (+/-)

0.05 %

0.05 %

Temperature error (relative to input range), (+/-)

0.005 %/K

0.005 %/K

Linearity error (relative to output range), (+/-)

0.05 %

Temperature error (relative to output range), (+/-)

0.02 %/K

Operational error limit in overall temperature range

  • ● Voltage, relative to input range, (+/-)

0.6 %; ±0.6 to ±0.7 %

0.06 %; ±0.06 to ±0.7%

  • ● Current, relative to input range, (+/-)

0.6 %; ±0.6 to ±0.7 %

0.06 %; ±0.06 to ±0.7%

  • ● Resistance thermometer, relative to input range, (+/-)

0.6 %; ±0.6 to ±0.7 %

0.06 %; ±0.06 to ±0.7%

  • ● Voltage, relative to output range, (+/-)

0.5 %

  • ● Current, relative to output range, (+/-)

0.6 %

Basic error limit (operational limit at 25 °C)

  • ● Voltage, relative to input range, (+/-)

0.04 %; ±0.04 to ±0.5 %

0.04 %; ±0.04 to ±0.5 %

  • ● Current, relative to input range, (+/-)

0.04 %; ±0.04 to ±0.5 %

0.04 %; ±0.04 to ±0.5 %

  • ● Resistance thermometer, relative to input range, (+/-)

0.04 %; ±0.04 to ±0.5 %

0.04 %; ±0.04 to ±0.5 %

  • ● Voltage, relative to output range, (+/-)

0.4 %

  • ● Current, relative to output range, (+/-)

0.5 %

Interference voltage suppression for f = n x (f1 +/- 1 %), f1 = interference frequency

  • ● Series mode interference (peak value of interference < rated value of input range), min.

40 dB

40 dB

  • ● Common mode interference (USS < 2.5 V) , min.

70 dB

70 dB

Interrupts/diagnostics/status information

Substitute values connectable

Yes; Parameterizable

Yes; Parameterizable

Integrated Functions

Control technology

  • ● Number of closed-loop controllers

4

4

Potential separation

Potential separation controller

  • ● between the channels

No

No

  • ● between the channels and backplane bus

Yes; Optocoupler

Yes; Optocoupler

Permissible potential difference

Between the inputs and MANA (UCM)

2.5 V DC

2.5 V DC

Isolation

Isolation tested with

500 V DC

500 V DC

Connection method

required front connector

2x 20-pin

2x 20-pin

Dimensions

Width

80 mm

80 mm

Height

125 mm

125 mm

Depth

120 mm

120 mm

Weights

Weight, approx.

470 g

470 g