ABB CL-LMR 18AC2 Series User Manual

High-speed counters,
CL-DC1, CL-DC2
125
1SVC 440 795 M0100
High-speed counters
You can use the high-speed counters to count high
frequency signals reliably.
The logic relay provides two high-speed up/down counters
C13 and C14 for use as required. The high-speed counter
inputs are permanently connected to the digital inputs I1 and
I2. This counter relay allows you to count events
independently of the cycle time.
The high-speed counters allow you to enter an upper
threshold value as a comparison value. The C13 and C14
high-speed counters are not dependent on the cycle time.
Counter frequency and pulse shape
The maximum counter frequency is 1 kHz.
The signals must be square waves. We recommend a mark-
to-space ratio of 1:1.
If this is not the case:
The minimum mark-to-space ratio is 0.5 ms.
t
min
= minimum time of the pulse or pause duration
f
max
= maximum count frequency (1 kHz)
Wiring of a high-speed counter
The digital inputs have the following assignment:
• I1: high-speed counter input for counter C13.
• I2: high-speed counter input for counter C14.
t
min
= 0.5 x
1
f
max
h
High-speed counters operate independently of the
program cycle time. The result of the actual value setpoint
comparison is only transferred once every program cycle
for processing in the circuit diagram.
The reaction time in relation to the setpoint/actual value
comparison can therefore be up to one cycle in length.

ABB CL-LMR 18AC2 Series Specifications

General

Rated Voltage	250 V AC
Category	Relays
Output	2 c/o (SPDT) contacts
Terminal Type	Screw Terminal
Contact Configuration	2 c/o (SPDT) contacts
Electrical Life	100, 000 operations
Mechanical Life	10, 000, 000 operations

Summary

Logic relay

Installation

Danger of electric shock

Highlights crucial safety rules to prevent electrical hazards during installation.

Mounting

Connecting the power supply

Explains the procedures for connecting AC and DC power supplies to the logic relay.

Connecting the inputs

Guides on wiring various types of digital and analog inputs to the logic relay.

Connecting outputs

Explains how to connect relay and transistor outputs to loads like contactors and motors.

Commissioning

Creating your first circuit diagram

Offers a step-by-step guide to wiring and creating a basic CL circuit diagram.

Testing the circuit diagram

Wiring with the logic relay

Analog value comparator/threshold value switch

Explains the use of analog comparators for threshold switching and comparing input values.

CL settings

Password protection

Covers setting up password protection for unauthorized access to the logic relay.

Setting date and time

Startup behaviour

Retention (non-volatile data storage)

Explains how actual values and settings are retained after power loss or device reset.

Inside the logic relay

Delay times for inputs and outputs

Monitoring of short-circuit/overload with CL-LST, CL-LMT and CL-LET

Details how to monitor outputs for short-circuits or overloads using internal inputs.

Saving and loading circuit diagrams

Memory module

CL-SOFT

CL-SOFT

Introduces the PC software for creating, storing, test and managing CL circuit diagrams.

What happens if …?

Messages from the CL system

Possible situations when creating circuit diagrams

Provides troubleshooting steps for common issues encountered during circuit diagram creation and operation.

Appendix

Technical data

Contains comprehensive technical specifications covering environmental, mechanical, and electrical data.