Implementation of the Module DC541-CM

Note

The implementation of the module functions of the function module DC541-CM is performed by means of function blocks. Access to the channels configured as normal inputs and outputs is performed using the function block DC541 IO: DC541_IO

Configuration of DC541-CM is described in the chapter for Automation Builder configuration DC541-CM Configuration: DC541-CM Interrupt and Counter ModuleDC541 Hardware: Digital Input/Output Module DC541-CMDC541 Library: DC541 Library

The module’s cycle time is set automatically depending on its channel configuration. The following values are possible for the cycle time:

I/O device:		50 µs
Counting device:	1-2 functions 3-4 functions 5-8 functions	50 µs 100 µs 200 µs

“Functions” are:

PWM	Pulse width modulator
FREQ	Time and frequency measurement
FREQ_OUT	Frequency output
32BIT_CNT	32 bit counter
FWD_CNT	32 bit forward counter
LIMIT	Limit value monitoring for the 32 bit counter

The used cycle time can be read at output CYCLE of the block DC541_GET_CFG: DC541_GET_CFG DC541_GET_CFG.

The following table shows an overview of all possible combinations.

Con- figured as	Function/ can be con- figured for channel	C0	C1	C2	C3	C4 to C7	Max. number of channels for this function	Remark and reference to alternative combinations (a and b)
Mode 1: Interrupt function; mutually exclusive with mode 2 (counting functions).
Interrupt	Dig. input	1	1	1	1	4	8	Each channel can be configured individually as interrupt input or output.
	Interrupt inp.	1	1	1	1	4	8
	Dig. output	1	1	1	1	4	8
Mode 2: Counting functions and multifunctional I/Os; mutually exclusive with mode 1 (interrupt functions).
Multi-function I/Os, PWM, counters, time and frequency measuring	Dig. input	1	1	1	1	4	8	Normal input
	Dig. output	1	1	1	1	4	8	Normal output
	PWM, resolution 10 kHz	1	1	1	1	4	8	Outputs a pulsed signal with an adjustable on-off ratio.
	Frequency output, resolution 2.5 kHz	1	1	1	1	4	8	Outputs an adjustable frequency (endless output or output of a specified number of pulses).
	Up/down counter, 50 kHz	1	1	OK *1)	OK *1)	OK *1)	2	*1) a) Both channels (0 and 1) configured as 50 kHz counter => Channels 2 to 7 can be configured as digital I/Os. b) Only one channel (0 or 1) configured as 50 kHz counter  => Second channel can be configured as counter < 50 kHz or for time/frequency measurement with a max. resolution of 200 µs. The remaining channels (2 to 7) can be configured as digital I/Os.
	Up/down counter, 5 kHz	1	1	1	1	OK *2)	4	*2) Four channels (0 to 3) configured as 5 kHz counter => Channels 4 to 7 can be configured as digital I/Os. Only a portion of the 4 channels (0 to 3) configured as 5 kHz counter => The other ones (of channels 0 to 3) can be configured as desired: as 2.5 kHz counter or for time/frequency measurement with a max. resolution of 200 µs or as digital I/Os. The remaining channels (4 to 7) can be configured as digital I/Os.
	Up/down counter, 2.5 kHz	1	1	1	1	4	8
	Time/ frequency measurement, resolution 50 µs	1	OK *3)	OK *3)	OK *3)	OK *3)	1	*3) Channel 0 configured for a max. resolution of 50 µs => Channels 1 to 7 can be configured as digital I/Os.
	Time/ frequency measurement, resolution 100 µs	1	1	OK *4)	OK *4)	OK *4)	2	*4) Two channels (0 and 1) configured for a max. resolution of 2x100 µs => Channels 2 to 7 can be configured as digital I/Os. Only one channel (0 or 1) configured for a max. resolution of 50 µs => Second channel (0 or 1) can be configured as counter < 50 kHz or for time/frequency measurement with a max. resolution of 200 µs. The remaining channels (2 to 7) can be configured as digital I/Os.
	Time/ frequency measurement, resolution 200 µs	1	1	1	1	4	8	Times, frequencies and rotational speeds are measured with a max. resolution of 200 µs.
High-speed counter	Bidirectional 32 bit counter, 50 kHz max.	Channels 0 to 3: Track A, track B, zero track, touch trigger				OK *6)	1	For connection of an incremental transmitter. For signals up to 50 kHz. This frequency corresponds to a motor with a rotational speed of 3000 rpm. The counter always uses the first 4 channels (0 to 3). *6) The remaining channels (4 to 7) can be configured as limit values, as 5 kHz counters, for time/frequency measurement with a resolution of 200 µs or as digital I/Os.
	Axis of rotation (endless counting)	1				OK *7)	1	“Endless” forward counting. An overflow occurs corresponding to the 32 bit value. *7) The remaining channels can be configured as limit values, as 5 kHz counters, for time/frequency measurement with a resolution of 200 µs or as digital I/Os.
	32 bit counter incl. sign	1				OK *8)	1	*8) The remaining channels can be configured as limit values, as 5 kHz counters, for time/frequency measurement with a resolution of 200 µs or as digital I/Os.
	Limit values for 32 bit counter	OK  *9)				1	1	Various counting values of the 32 bit counter can be displayed directly via these outputs. *9) In this case, the channels 0 to 3 are used as 32 bit counters.