ABB AC500 PLC Hardware Manual page 336

Device Specifications
I/O Modules > Digital I/O Modules
The states of the inputs/outputs are indicated by yellow LEDs (one per channel). There is no
potential separation between the channels.
Functionality
Parameter
Digital inputs/outputs
Fast counter
LED displays
Internal power supply
External power supply
Effect of incorrect input terminal connection
In the operating mode Interrupt I/O device, the channels can be configured as follows:
● Input
● Output
● Interrupt input
In this way, important input information can be evaluated independently of the program cycle
and outputs can be set.
In the operating mode Counter, the channels can be configured as follows:
● Input
● Output
● 32-bit up/down counter (uses C0...C3) as a 32-bit-counter without limit
● 32-bit periodic counter as a 32-bit counter with a limit
● Limiter for a 32-bit counter (limit channel 0)
● 32-bit up counter (forward counter) with the frequencies 50 kHz, 5 kHz and 2.5 kHz
● Pulse-width modulation (PWM) with a resolution of 10 kHz
● Time and frequency measurement
● Frequency output
Used as a fast counter module, the 8 channels of the multi-function module DC541-CM can be
configured and combined individually, easily and versatilely in the PLC configuration. The
module is therefore also excellent for universal high-frequency counting tasks up to 50 kHz. In
addition, it has measuring functions for rotational speed, time and frequency.
These different channel configurations can now be combined flexibly on-board.
Example 1: 32-bit up/down counter incl. zero trace and touch-trigger for max. 50 kHz plus 4
accompanying limiting values (comparison values). When the counter reaches one of the com-
parison values, the corresponding output can be set in order to trigger control functions at the
machine or installation directly.
Example 2: 2 counters for 50 kHz plus frequency measurement with a resolution of 200 µs plus
4 digital I/Os.
Further examples and a detailed description of the fields of application are contained in the
chapter "System Technology of DC541.
Commissioning is carried out via the user program by using the appropriate function blocks.
336
Value
8 (24 VDC)
Integrated, many configurable operating
modes
For signal states, errors and supply voltage
Through the communication module bus
Via the terminals ZP and UP (process voltage
24 VDC)
Wrong or no signal detected, no damage up to
35 V
3ADR010121, 13, en_US 2019/04/17