One-channel intelligent counter module for simple counting tasks
For direct connection of incremental encoders
Comparison function with 2 specifiable comparison values
Integrated digital outputs to output the response upon reaching the comparison value.
Start/stop counter with gate function
Incremental encoders and pre-assembled connecting cables for counting and positioning functions are offered under SIMODRIVE Sensor or Motion Connect 500.
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SIMATIC S7-300, COUNTER MODULE FM 350-1 FOR S7-300, COUNTER FUNCTIONS UP TO 500 KHZ 1 CHANNEL FOR CONNECTION OF 5V AND 24V INCREMENTAL ENCODERS ISOCHRON MODE, MEASUREMENT MODE INCL. CONFIG. PACKAGE ON CD
Direct connection for gate signals (light barrier etc.) using integrated digital inputs.
A comparison function and output of response using integrated digital output modules.
The following functions are provided:
1 channel for upcounting and downcounting; 32 bit
Counting frequency up to 500 kHz (RS 422 encoders)
Counting range 0 to 32 bit or +/- 31 bit, as required
One-shot or periodic counting process
1-, 2- or 4-fold evaluation
Incremental encoder can be connected
Gate control via levels, pulses or software control
Setting via the digital input
Counter can be loaded with a predefined starting value
Comparison function using two selectable comparison values
Interrupt response when a comparison value is reached, zero crossing, range violation (selectable)
Output signal (24 V-level) that the comparison function controls: With jointly selectable pulse duration or as a continuous signal from the comparison value to the limit of the counting range.
Standard Function Blocks
CNT_CTRL (FC 0)
For controlling the counters of the FM 350-1
DIAG_INF (FC 1)
For providing the diagnostic information of the FM 350-1
Mode of operation
The FM 350-1 counter module detects pulses from incremental encoders at up to 500 kHz, as a function of directly connectable gate signals.
It evaluates the direction of the pulses and compares the actual value with two comparison values, which can be preset.There are two possibilities available to output the reaction to the process:
2 digital outputs;
they can be configured using the selectable minimum pulse or with level switching.
the FM 350-1 can send an alarm signal to the CPU via the integrated backplane bus.
After the gate is enabled, endless counting takes place between the lower and upper count limit from the starting value
After the gate is enabled, the system counts once from the starting value to the upper or lower limit depending on the main count direction
Main counting direction up: from 0 to the programmable range limit
Main counting direction down: from the programmable start value to 0
After the gate is enabled, periodic counting takes place from the starting value within the programmed counting range depending on the main count direction
Main counting direction up: periodic from 0 to the programmed range limit – 1
Main counting direction down: periodically from the programmed start value to 1
Parameters are assigned with STEP 7 with the help of parameterization screen forms. A configuring package is available for this purpose.
The FM 350-1 is the intelligent single-channel counter module for a wide range of basic counting tasks. It can be used in the SIMATIC S7-300 and in the ET 200M (with S7-300/-400 as master).
Assembly and handling equipment
The module provides the encoder supply.
It has the following mechanical features:
The rugged plastic housing contains:
Fault LEDs (GF)
LEDs to indicate that the counter is running (CR) and the counting direction (DIR)
LEDs for digital input and output modules.
Slot for the front connector, protected by the front cover
Labeling area on the front cover
The module is simply mounted in the rack and screwed tight. It can be fitted with a coding key, which assigns it permanently to a specific slot.
Coding connector (measurement range module for analog inputs) for selecting the type of encoder (5 V or 24 V)
The module is wired by means of a plug-in front connector. When the connector is plugged in for the first time a coding element in the module engages, so that the connector can only be plugged into modules of the same type. When the module is replaced, the front connector can be used in its fully wired state for the new module of the same type.
The configuring package required for configuration comprises:
“Getting Started” instructions
Parameterization screen forms
Standard function blocks for data exchange with the CPU
SIMATIC S7-300, COUNTER MODULE
Auxiliary voltage 1L+, load voltage 2L+
● Rated value (DC)
● permissible range, lower limit (DC)
20.4 V; Dynamic 18.5 V
● permissible range, upper limit (DC)
28.8 V; dynamic 30.2 V
— Recovery time
from load voltage 1L+ (without load), max.
from backplane bus 5 V DC, max.
5 V encoder supply
● 5 V
Yes; 5.2 V ±2 %
● Output current, max.
24 V encoder supply
● 24 V
Yes; 1L+ (-3 V)
● Output current, max.
Power loss, typ.
Number of digital inputs
1 for gate start, 1 for gate stop, 1 for setting the counter
● for signal “0”
-28.8 … +5V
● for signal “1”
+11 to +28.8V
● for signal “1”, typ.
Number of digital outputs
Yes; Clocked electronically
Limitation of inductive shutdown voltage to
2L+ (-39 V)
● for signal “0”, max.
● for signal “1”, min.
2L+ (-1,5 V)
● for signal “1” rated value
● for signal “1” permissible range for 0 to 60 °C, min.
● for signal “1” permissible range for 0 to 60 °C, max.