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Overview • 4-channel closed-loop con-trol module specially for tem- perature controls
• With convenient, integrated online self-optimization • Heating and cooling con-
trols as well as combined controls with a heating and active cooling function can be implemented • Ready-to-use controllers • 2 versions: - FM 355-2 C as a continu- ous-action controller; - FM 355-2 S as a step-ac-
tion or pulse controller • With 4 analog outputs (FM
355-2 C) or 8 digital outputs (FM 355-2 S) for direct con- trol of the most commonly used final control elements • The controller will continue to operate in the event of a CPU Stop or CPU failure
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Technical specificationsNumber of controllers 4 General specifications
Rated load voltage L+ 24 V DC
• Permitted range 20.4 to 28.8 V
Electrical isolation
• To backplane bus Yes (optocoupler)
• Between channels No
Permissible potential difference • Between input (frame terminal and
the central grounding point)
75 V DC, 60 V AC • Between analog inputs and NANA
(UCM )
2.5 V DC • Isolation tested at 500 V DC Current consumption
• From backplane bus, typ./max. 50 mA/75 mA • From L+ (without load)
- FM 355-2 C, typ. 260 mA
- FM 355-2 C, max. 310 mA
- FM 355-2 S, typ. 220 mA
- FM 355-2 S, max. 270 mA
Total current of the digital outputs, max. 400 mA Power loss • FM 355-2 C, typ. 6.5 W • FM 355-2 C, max. 7.8 W • FM 355-2 S, typ. 5.5 W • FM 355-2 S, max. 6.9 W
Required front connector 2 x 20-pin Dimensions (W x H x D) in mm 80 x 125 x 120 Weight, approx. 470 g Digital inputs • Number 8 Input voltage • Rated value 24 V DC • At ”0” signal -3 to +5 V • At ”1” signal 13 to 30 V
Input current at ”1” signal, typ. 7 mA
Input characteristic In accordance with ICE 1131, Typ 2
Connection of two-wire BEROs Possible • Permissible quiescent current,
max. 1.5 mA Line length • Unshielded 600 m • Shielded 1000 m Digital outputs
• Number of inputs 8 (only FM 355-2S) Output voltage • At signal ”1” L+ (-2.5 V) Output current • At ”1” signal - rated value 0.1 A - permitted range 5 to 150 mA
• At ”0” signal, residual current, max.
0.5 mA
Load resistance 240 Ω to 4 kΩ
Output power
• Lamp load, max. 5 W
Switch 2 outputs in parallel For logic operations Setting a digital input Possible
Switching frequency
• With resistive load/lamp load, max. 100 Hz • Inductive loads, max. 0.5 Hz Voltage induced on circuit interrup- tion limited to (internally), typ.
L+(-1.5 V) Short-circuit protection of output Yes, electronic Line length
• Unshielded 600 m
• Shielded 1000 m
Analog inputs
Number of inputs 4
Input range (rated values/ display range/ input resistance)
• Voltage 0 to 10V/ -1.75 to 11.75V/
100 kΩ
• Current 0 to 20 mA/
-3.5 to 23.5 mA/50 Ω
FM 355-2 closed-loop control module
Function modules
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Technical specifications (continued)• Thermocouple type B/0 to 13.81 mV/10 MΩ E/ -9.84 to 76.36mV/ 10 MΩ J/-8.1 to 69.54 mV/10 MΩ K/-6.54 mV to 54.88/10 MΩ R/-0.23 to 21.11 mV/10 MΩ S/-0.24 to 18.7 mV/10 MΩ • Resistance thermometer Pt 100/30.82 to 650.46 mV/ 10 MΩ Principle of measurement Integrating Resolution (including overrange) 14-bit
Conversion time per analog input 100 ms at 50 and 60 Hz Transient recovery time
• For resistive load 0.1 ms
• Capacitive loads 3.3 ms
• Inductive loads 0.5 ms
Substitute values injectable Yes, parameterizable Permissible input voltage for volt-
age input (destruction limit)
20 V Permissible input current for current input (destruction limit)
40 mA
Connection for transducer For voltage measurement and for current measurement (as 4-wire transducers)
Linearization of characteristic Yes, parameterizable • For thermocouples Type B,E, J, K, R, S • For resistance thermometers Pt 100 (standard range) Temperature compensation Yes, parameterizable, via internal
sensor or externally with Pt 100 Noise voltage suppression for f = n
x (fl +/- 1 %), fl = noise frequency • Common-mode noise, min.
(Vpp < 2.5 V)
70 dB • Series-mode noise, min.
(peak value of fault < rated value of input range)
40 dB
Operational limit (in the entire tem- perature range, referred to input range)
+/-0.06 to +/-0.7%
Basic error limit (operating error limit at 25 °C, referred to the input range)
+/-0.04 to +/-0.5%
Temperature error (referred to input range)
+/-0.005%/K Linearity error (referred to input
range)
+/-0.05%
Cable length (shielded) 200 m, 50m at 80 mV and ther- mocouples
Analog outputs
• Number of inputs 4 (only FM 355-2C)
• Output ranges +/-10 V / 0 to 10 V
0 to 20 mA, 4 to 20 mA Load resistor
• Voltage outputs, min. 1 kΩ - capacitive load, max. 1 µF • Current outputs, max. 500 Ω
- inductive load, max. 1 mH Voltage output
• Short-circuit protection Yes • Short-circuit current, max. 25 mA Current output
• Idle voltage, max. 18 V
Connection of actuators
• For voltage output 2-lead connection • For current output 2-lead connection Operating error limit (in the entire
temperature range of the modules, relative to input range)
• Voltage +/- 0.5%
• Current +/- 0.6%
Basic error threshold (operating error threshold at 25 °C, with refer- ence to output range)
• Voltage +/- 0.2%
• Current +/- 0.3%
Temperature +/- 0.02%/K
Linearity error +/- 0.05%
Cable length (shielded) 200 m, 50m at 80 mV and ther- mocouples
Function modules
FM 355-2 closed-loop control module
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Technical specifications, function blocks1) Dependent on the parameterization of READ_OUT, LOAD_OP and LOAD_PAR (READ_PAR)
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Ordering data Order No. Order No.FB Memory requirements Runtimes
FB length in load memory DB length in load memory in S7-300/C7 (for CPU 315-2DP)
in S7-400 (for CPU 416-2DP)
FMT_PID 1.804 byte 490 byte 0.65 … 7.41 ms1) 0.04 … 0.82 ms1)
FMT_PAR 324 byte 172 byte 1.7 ms 0.19 ms
FMT_CJ_T 410 byte 214 byte 1.8 ms 0.19 ms
FMT_DS1 216 byte 184 byte 1.9 ms 0.19 ms
FMT_TUN 332 byte 178 byte 4.5 ms 0.19 ms
FMT_PV 1108 byte 410 byte 4.3 ms 3.8 ms
READ_PV =TRUE 3.2 ms 0.28 ms
LOAD_PV=TRUE 2.9 ms 0.35 ms
Target system SIMATIC S7-300 (from CPU 314), S7-400, C7
FM 355-2 C temperature closed-loop control module
6ES7 355-2CH00-0AE0 with 8 digital outputs for 4 step or
pulse controllers FM 355-2 S temperature closed-loop control module
6ES7 355-2SH00-0AE0 with 4 analog outputs for 4 contin-
uous-action controllers Front connector
20-pin, with screw-type terminals
• 1 unit 6ES7 392-1AJ00-0AA0
• 100 units 6ES7 392-1AJ00-1AB0
20-pin, with spring-loaded termi- nals
6ES7 392-1BJ00-0AA0
Bus connector 6ES7 390-0AA00-0AA0
1 unit (spare part)
Labelling strips 6ES7 392-2XX00-0AA0 10 units (spare part)
S7-SmartLabel 2XV9 450-1SL00-0YX0 Software for machine labelling of
modules directly from the STEP 7 project
Labelling sheets for machine labelling
See "Accessories"
Slot number label 6ES7 912-0AA00-0AA0 Spare part
Shield connecting element 6ES7 390-5AA00-0AA0 80 mm wide, with 2 rows for 4 ter-
minal elements each Terminal elements 2 units
For 2 cables with 2 to 6 mm diameter
6ES7 390-5AB00-0AA0 For 1 cable with 3 to 8 mm
diameter
6ES7 390-5BA00-0AA0 For ,1 cable with 4 to 13 mm
diameter