FM COUNTER MODULE

Transcription

1 FM COUNTER MODULE Function The module off-loads the CPU by: Direct connection of one incremental encoder per channel Direct connection for gate signals (light barrier, etc.) using integrated digital inputs A comparison function and output of response via integrated digital output modules The following functions are provided: Two channels for upcounting and downcounting; each 32-bit Counting frequency up to 500 khz (RS 422 encoders) Counting range 0 to 32 bit or±31 bit, as desired One-time or periodic counting process Single, double or quadruple evaluation Can be connected to incremental encoders; e.g., initiators, 24 V encoders or RS 422 encoders (5 V) Gate control via levels Setting via the digital input Counter can be loaded with a predefined starting value Comparison function using two user-definable reference values Interrupt response when a reference value is reached, zero crossing, range overrun (selectable) Output signal (24-V level), controlled by the comparison functions: with jointly specifiable pulse duration or as a continuous signal from the comparison value to the limit of the counting range. Page 1489 Mar 2008 Siemens ITS

2 Standard Function Blocks CNT_CTRL (FC 0) Controls the counters of the FM DIAG_INF (FC 1) For providing the diagnostic information of the FM Mode of operation The FM counter module detects pulses from incremental encoders at up to 500 khz, as a function of directly connectable gate signals. It analyzes the direction of the pulses and compares independently on each channel the respective actual values with two specifiable comparison values. There are two possibilities available to output the reaction to the process: Digital outputs: These can be configured via a common register with a selectable minimum pulse or with level switching. Backplane bus: the FM can send an interrupt to the CPU via the integrated backplane bus. Operating Modes Continuous counting After the gate is enabled, endless counting takes place between the lower and upper count limit from the starting value Page 1490 Mar 2008 Siemens ITS

3 One-shot counting Periodic counting Parameterization Depending on the main counting direction and beginning with the start value, there is one-shot counting up to the upper or lower range limit after the gate is enabled. 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: Periodically from 0 to the programmable upper range limit -1. Main counting direction down: Periodically from the programmed start value to 1. Parameters are assigned with STEP 7 taking into account the parameterization screen forms. A configuring package is available for this purpose. Technical specifications Page 1491 Mar 2008 Siemens ITS

4 Supply voltage Load voltage 1L+ Reverse polarity protection Load voltage 2L+ Reverse polarity protection Aux. voltage 1L+, load voltage 2 L+ Rated value (DC) permissible range, lower limit (DC) permissible range, upper limit (DC) non-periodic skip 6ES AP00-0AE0 Yes Yes 24 V 20.4 V; Dynamic 18.5 V 28.8 V; dynamic 30.2 V 500 ms Duration 50 s Recovery time 35 V Value Input current from load voltage 1L+ (without load), max. 40 ma from backplane bus 5 V DC, max. 450 ma Encoder supply 5 V encoder supply 5 V Yes; 5.2 V +/-2% Short-circuit protection Yes Page 1492 Mar 2008 Siemens ITS

5 Output current, max. 300 ma 24 V encoder supply 24 V Yes; 1L+ (-3 V) Short-circuit protection Yes Output current, max. 300 ma Power losses Power loss, typ. 9 W Digital inputs Number/binary inputs 6 Functions 1 for gate start, 1 for gate stop, 1 for setting the counter Input voltage for signal "0" to +5 V for signal "1" +11 to V Input current for signal "1", typ. 9 ma Input delay (for rated value of input voltage) Input frequency (with a time delay of khz ms), max. for standard inputs Yes Parameterizable 2.5 µs; >= 2.5 µs (200 khz); <= 25 µs (20 Page 1493 Mar 2008 Siemens ITS

6 at "0" to "1", max. khz) Digital outputs Number/binary outputs 6 Functionality/short-circuit strength Yes; Clocked electronically Limitation of inductive shutdown voltage to 2L+ (-39 V) Output voltage for signal "0" (DC), max. 3 V for signal "1", min. 2L+ (-1.5 V) Output current for signal "1" rated value 0.5 A for signal "1" permissible range for 0 to 5 ma 60 C, min. for signal "1" permissible range for 0 to 0.6 A 60 C, max. Output delay with resistive load 0 to "1", max. 300 µs Encoder Connectable encoders Incremental encoder (symmetrical) Yes; With 2 pulse trains offset by 90 Incremental encoder (asymmetrical) Yes 24 V initiator Yes 24 V directional element Yes; 1 pulse train, 1 direction level Counter Page 1494 Mar 2008 Siemens ITS

7 Number of counter inputs 2; 32 bit or +/-31 bit Counter input 5 V Type RS 422 Terminating resistor 220 Ω Differential input voltage min. 0.5 V Counting frequency, max. 500 khz Counter input 24 V Input voltage, for signal "0" -30 to +5 V Input voltage, for signal "1" +11 to +30 V Input current, for signal "1", typ. 9 ma Counting frequency, max. 200 khz Minimum pulse width Parameter Remark Galvanic isolation Galvanic isolation digital inputs between the channels and the backplane bus Galvanic isolation digital outputs between the channels and the backplane bus Galvanic isolation counter >= 2.5 µs (200 khz); <= 25 µs (20 khz) (parameterizable) Assigned binary addresses: 64 bytes/64 bytes Yes; Optocoupler Yes; Optocoupler Page 1495 Mar 2008 Siemens ITS

8 between the channels and the backplane bus Permissible potential difference between different circuits Isolation Isolation checked with Connection method required front connector Dimensions Width Height Depth Weight Weight, approx. Yes; Optocoupler 75 VDC / 60 VAC 500 V 1x 48-pin 25 mm 290 mm 210 mm 650 g Page 1496 Mar 2008 Siemens ITS