S7-300 FM 351 two-channel positioning module handles the adjustment

Product No. / Product Description Listprice / Your price
6ES7351-1AH02-0AE0
SIMATIC S7-300, FM 351 POSITIONING MODULE FOR RAPID/ CREEP FEED DRIVE INCL. CONFIG. PACKAGE ON CD

FM 351 positioning module

  • Two-channel positioning module for rapid-traverse/creep-speed drives
  • 4 digital outputs per channel for motor control
  • Incremental or synchro-serial position decoding

Note:

SIMODRIVE Sensor/Motion Connect 500 feature position-measuring systems and preassembled connecting cables for counting and positioning functions.

ApplicationFM 351 positioning module

The FM 351 two-channel positioning module handles the adjustment of mechanical axes on rapid-traverse and creep-speed drives. The module is used for positioning adjustment axes and setting-up axes, preferably with standard motors, controlled via contactors or frequency converters.

The module is used in:

  • Packaging machines
  • Lifting gear and conveying equipment
  • Woodworking machinery
  • Paper and printing machinery
  • Rubber- and plastics-processing machines
  • Machine tools

Design

A positioning controller with the FM 351 features the following essential components:

  • FM 351:
    • For the positioning of two independent axes
  • S7-300 CPU:
    • For sequence control
    • For starting and stopping positioning actions
  • Programming device:
    • For programming the STEP 7 program
    • For parameterizing the FM 351 with STEP 7 using parameterization screen forms
    • For testing and startup
  • Operator panel (optional):
    • For operator control and monitoring of the machine
    • For error diagnostics

The FM 351 and CPU are linked via technology blocks.

Function

Positioning functionality
  • Setup:
    Move the rapid-traverse or creep-speed axis into position at the touch of a button.
  • Absolute incremental feed mode:
    The axis is moved to an absolute target position. The numerical values are stored in a table on the FM 351.
  • Relative incremental feed mode:
    The axis is moved through a set route.
  • Reference point motion:
    For synchronization after the PLC has been turned in when using incremental position encoders.
Special functions
  • Zero offset
  • Set reference point
  • Delete distance to go
Mode of operation

Preparatory steps for a positioning task:

  • Coordination of mechanical system and electronics:
    Easily achieved by entering machine data.
  • Specification of target position and traversing speed via the S7 CPU or the configuring software
  • Transfer of the interface signals from the CPU to the FM 351 (start, stop)

The FM 351 handles the actual positioning task:

  • 4 digital outputs controlling the rapid-traverse, creep-speed, counterclockwise and clockwise functions are assigned to each channel.
  • Creep speed or rapid-traverse/creep speed is specified depending on the distance to the target.
  • After the cutoff point is reached, the module monitors the target approach. After the target area is reached, a signal is sent to the CPU.
Technical specifications

Article number

6ES7351-1AH02-0AE0

FM351 POSITIONING MOD. RAPID/CREEP FEED

Supply voltage

Rated value (DC)

  • ● 24 V DC

Yes

permissible range, lower limit (DC)

20.4 V

permissible range, upper limit (DC)

28.8 V

Load voltage L+

  • ● Rated value (DC)

24 V

  • ● permissible range, lower limit (DC)

20.4 V

  • ● permissible range, upper limit (DC)

28.8 V

Input current

Current consumption, max.

350 mA

from backplane bus 5 V DC, max.

150 mA

Encoder supply

5 V encoder supply

  • ● 5 V

Yes

  • ● Output current, max.

350 mA

  • ● Cable length, max.

32 m

24 V encoder supply

  • ● 24 V

Yes

  • ● Output current, max.

400 mA; Per channel

  • ● Cable length, max.

100 m

Power loss

Power loss, typ.

7.9 W

Digital inputs

Number of digital inputs

8

Functions

Reference cams, reversing cams, flying actual value setting, start/stop positioning

Input voltage

  • ● Rated value (DC)

24 V

  • ● for signal “0”

-3 to +5V

  • ● for signal “1”

+11 to +30V

Input current

  • ● for signal “0”, max. (permissible quiescent current)

2 mA

  • ● for signal “1”, typ.

6 mA

Digital outputs

Number of digital outputs

8

Functions

Rapid traverse, creep, run right, run left

Short-circuit protection

Yes

Output voltage

  • ● Rated value (DC)

24 V

  • ● for signal “1”, min.

UP – 0.8 V

Output current

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

5 mA; with UPmax

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

600 mA; with UPmax

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

0.5 mA

Encoder

Connectable encoders

  • ● Incremental encoder (symmetrical)

Yes

  • ● Incremental encoder (asymmetrical)

Yes

  • ● Absolute encoder (SSI)

Yes

  • ● 2-wire sensor

Yes

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

2 mA; on signal “0”, max. 2 mA; on signal “1”, max. 6 mA

Encoder signals, incremental encoder (symmetrical)

  • ● Trace mark signals

A, notA, B, notB

  • ● Zero mark signal

N, notN

  • ● Input voltage

5 V difference signal (phys. RS 422)

  • ● Input frequency, max.

0.5 MHz

Encoder signals, incremental encoder (asymmetrical)

  • ● Trace mark signals

A, B

  • ● Zero mark signal

N

  • ● Input voltage

24 V

  • ● Input frequency, max.

50 kHz; 50 kHz for 25 m cable length; 25 kHz for 100 m cable length

Encoder signals, absolute encoder (SSI)

  • ● Input signal

5 V difference signal (phys. RS 422)

  • ● Data signal

DATA, notDATA

  • ● Clock signal

CL, notCL

  • ● Telegram length, parameterizable

13 or 25 bit

  • ● Clock frequency, max.

1.5 MHz

  • ● Gray code

Yes

  • ● Cable length, shielded, max.

200 m; At max. 188 kHz

Potential separation

Potential separation digital inputs

  • ● Potential separation digital inputs

Yes

Potential separation digital outputs

  • ● Potential separation digital outputs

Yes

Degree and class of protection

Degree of protection acc. to EN 60529

  • ● IP20

Yes

Ambient conditions

Ambient temperature during operation

  • ● min.

0 °C

  • ● max.

60 °C

Ambient temperature during storage/transportation

  • ● min.

-40 °C

  • ● max.

70 °C

Connection method

required front connector

1x 20-pin

Dimensions

Width

80 mm

Height

125 mm

Depth

120 mm

Weights

Weight, approx.

550 g