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Daniel Heslewood
daniel.heslewood@omron.com
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Why is #INF displayed in my instruction?
Published March 11th, 2025 by Daniel Heslewood
You may have come across a scenario in Cx-Programmer where the value of a memory address shows #INF as its value. This is telling you that the value of that memory address is evaluated as Infinity. This math error typical occurs as a result from floating point arithmetic. Below is a snippet of two scenarios. One where the value of D300 is showing +1
Prefixes in Cx-Programmer
Published March 18th, 2025 by Daniel Heslewood
In Cx-Programmer, an instruction operand can either be entered as a symbol, address or literal value. When learning to use Cx-Programmer, it can be confusing to know which prefix character to use when specifying literal numbers in an instruction. Below is an example of the prefixes available when specifying a literal value. Quick reference * An indi
Differential Vs Single-Ended Analog Inputs
Published September 9th, 2024 by Daniel Heslewood
This article aims to assist the user with the selection of an Analog input card for their NX system. The NX-AD series of input cards have both a single ended and differential version. The information below will provide an overview on the differences between the two, and general wiring guidelines highlighting compatibility between the possible combin
NX I/O Output Under Fault Condition
Published September 26th, 2024 by Daniel Heslewood
By default, NX-IO and expansion cards are configured to switch the output channels or bits to zero when a watchdog error, or a major fault is detected on the CPU unit / Communications Coupler. There are many scenarios where this behavior is not ideal and can cause disruptions to a particular process. This article will explain what settings are assoc
NX-RS1201 Quick Start Guide
Published March 20th, 2024 by Daniel Heslewood
Introduction This article covers how to set up the Load Cell Modular I/O card for the NX series PLC's using Sysmac Studio. Wiring Make the appropriate connections according to the load cell. Terminal Block Arrangement Wiring for 6-wire connection Wiring for 4-wire connection Adding the NX-RS1201 card in Sysmac Studio Double click
How to identify and log errors from Function Blocks
Published February 24th, 2025 by Daniel Heslewood
Introduction By default, most of the Function Blocks found within Sysmac Studio, have an error output bit associated with them. Motion control, SD Memory Card, and Communications Function Blocks, are all great examples which could produce an extensive range of errors that can be difficult to troubleshoot. Frequently we see these kinds of function bl
Expression vs Variable in NA
Published March 24th, 2025 by Daniel Heslewood
You may have noticed when programming an NA series HMI, that the behavior field of a toolbox item varies between items. Below shows the properties of a momentary button and data lamp. Where the momentary button uses a Variable for its behavior, and the data lamp uses an Expression for its behavior. What is the difference between the two? The title
Network Browser Error 0x82020003
Published November 6th, 2024 by Daniel Heslewood
When using a Direct Ethernet Connection to connect to a PLC, you may find that you are unable to connect to the PLC. The Network Browser may show the following error message. “The OMRON Ethernet Direct Connection Manager service is starting in Safe Mode because Windows APIPA is enabled. (0x82020003)” There are many possible causes for this err
NB-V1 in NB Designer
Published July 31st, 2025 by Daniel Heslewood
After purchasing an NB-V1, some common scenarios you may encounter are as followed: You may be unable to connect to the NB-V1 HMI. You might be unable to transfer an existing project into a new NB-V1 HMI. You are unable to locate a ‘V1’ HMI in the project PT section. You are unable to change the PT model to a NB-V1 variant. In all cases, the most l
What is #QNAN0 in CX-Programmer?
Published March 18th, 2025 by Daniel Heslewood
You may or may not have come across an instance in Cx-Programmer, where an instruction shows a result of +1.#QNAN0 as shown below in D200. This is letting us know that the instruction perceives the result as Not a Number (NaN). Not a Number is not a valid floating point calculation, therefore, normal floating point calculations will not result in Na
Calculating Memory Offset For CP1W Expansion Boards
Published April 4th, 2024 by Daniel Heslewood
Sometimes when a CP1W expansion unit has been added and configured to a PLC, the expansion unit does not read or write data correctly. This is typically because the destination words have been set incorrectly. This article will help you calculate the correct memory offset and destination word for your configuration. How many I/O words does my expans
Where can I find the update history for CX-One?
Published November 14th, 2024 by Daniel Heslewood
You can find the update history with this link. This link provides the update history for all components of the CX-One suite such as, CX-Programmer, CX-Drive, Network configurator etc. This can be useful to identify whether a specific issue may be resolved through a software update. You can review the update history for a specific piece of software
3G3MX2 is not reaching expected speed
Published April 14th, 2024 by Daniel Heslewood
During set up of the 3G3MX2 series of VSD's, a common issue is that the drive does not reach the expected frequency that has been set. This can happen for a few reasons but the most common reason we see is that the Frequency Reference Selection (A001) has been set incorrectly, or left as default. By default this is set to 02: Digital Operator. This
61F-LS Troubleshooting Guide
Published August 22nd, 2024 by Daniel Heslewood
This article aims to provide assistance during the setup of 61F series Floatless Level Switch. Please refer to the datasheet when following steps in this article, various models have differing pin arrangements therefore, incorrect wiring may result in damage to the unit. Please click here to download the datasheet. Basic Checklist Is the controller
Sysmac simulation not producing outputs
Published September 16th, 2025 by Daniel Heslewood
Problem When attempting to simulate a program in Sysmac Studio, you may come across a scenario where outputs do not appear to be updating correctly. Have a look at the example below. The simulation appears to be running. The color of the top of the Edit Pane changes to green. The ladder run shows a green power flow through Input 1 and out to the ri
ZEN Transition Guide
Published September 29th, 2024 by Daniel Heslewood
Introduction This article aims to help users transition from the discontinued ZEN relays, to the PLC based alternative using the CP1W-DAM01 LCD option board. This option board can be used with CP1L and CP1H series PLC's (excluding CP1L-L10). The user is expected to have a basic understanding of CX-Programmer. If you are unfamiliar with CX-Programmer
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