---
title: Modbus RTU/TCP Slave Configuration in CICON
description: Learn how to configure Modbus connectivity on the CIMON PLC-S/Micro-S CPU with our step-by-step guide.
image: https://blog.cimon.com/hubfs/logo-modbus-2000x1125.jpg
---

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 January 18, 2023

# Modbus RTU/TCP Slave Configuration in CICON

 By  [CIMON Automation](https://blog.cimon.com/author/cimon-automation)  ·   1 minute read

 

![logo-modbus-2000x1125](https://blog.cimon.com/hs-fs/hubfs/logo-modbus-2000x1125.jpg?width=2000&height=1125&name=logo-modbus-2000x1125.jpg)

In this guide, the CIMON PLC-S/Micro-S CPU will be used to demonstrate Modbus Slave configuration. The standalone PLC-S/Micro-S is a Modbus RTU/TCP Slave natively.

 

 

**Registering the PLC-S/Micro-S as a Modbus RTU/TCP Slave**

 

In the **Project Window** (Project Tree), expand the **Parameter** branch and double left-click **PLC Parameter**. Click the right arrow until you see Channel 1, Channel 2, Modbus, and Ethernet. Channel 1 and Channel 2 are used for configuring RS-232 and RS-485, respectively. The Modbus tab is for configuring your slave settings. The Ethernet tab is for configuring your CPU’s IP address.

 

![](https://blog.cimon.com/hubfs/image-png-4.png)

*Modbus Slave Setting Tab*

- Natively, the PLC-S/Micro-S is a Modbus slave, and the Ethernet/serial parameters only need to be configured to initiate communication with a master device.
- The PLC-S/Micro-S data registers assigned to a certain Modbus address range (i.e., Coil Status, Holding Register, etc.) may be changed with the dropdown menu. 
- The same data register cannot be used for multiple Modbus ranges (i.e., D cannot be used for multiple Modbus ranges (i.e., D cannot be used for both Input Registers and Holding Registers). 
- **Station No.** - The PLC-S/Micro-S's slave ID.

 

![](https://blog.cimon.com/hs-fs/hubfs/image-png-Jan-18-2023-08-49-11-5409-AM.png?width=935&height=510&name=image-png-Jan-18-2023-08-49-11-5409-AM.png)

*Example Modbus Address Mapping*

The above table demonstrates native mapping of the PLC-S/Micro-S data registers to Modbus addresses. Please keep in mind the hexadecimal offset when dealing with bit-level data registers (i.e., X & Y). Notice, for example, that Y000A maps onto 00011 and Y0010 maps onto 00017. The previously mentioned warning is often overlooked. However, in the latest version of CICON, **v8.10**, this will be handled simply by hovering your mouse over the contact/coil you want to know the Modbus address of, as shown in the below image. To enable this feature, go to **Tool** in the toolbar, then **CICON Options…** at the very bottom, and then navigate to the **LD Editor** tab. You will want to enable the **Show Contact Tooltip** option at the bottom right.

 

![](https://blog.cimon.com/hs-fs/hubfs/image-png-Jan-18-2023-08-49-38-8436-AM.png?width=1001&height=247&name=image-png-Jan-18-2023-08-49-38-8436-AM.png)

 

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