Choosing a remote I/O module for a control system is rarely about the module itself. The real decision is which network your controller already speaks, and how much you want to pay for a compatible node. In the control cables connectors io category, two modules show how different those answers can be: the Automation Direct H2-ERM100 DirectLOGIC DL205 remote I/O module at $159 and the ODOT Remote I/O Module Profinet IO CN-8032 at $300. One is tightly tied to a specific PLC family; the other brings Profinet IO to your rack. Here's how to decide without second-guessing yourself.
Quick verdict
If your controller is a DirectLOGIC DL205 CPU such as a D2-240, D2-250, D2-260, or Do-more H2, the H2-ERM100 is the direct match. If your network is built around Profinet IO and you want a module that is not open box, the CN-8032 is the one to take. The purchase decision comes down to protocol fit before price.
Comparison table
| Product | Price | Condition | Network / compatibility | Price bar |
|---|---|---|---|---|
| Automation Direct H2-ERM100 DirectLOGIC DL205 remote I/O module | USD 159.00 | New - Open box | DirectLOGIC DL205; one 10/100Base-T Ethernet port | |
| ODOT Remote I/O Module Profinet IO CN-8032 | USD 300.00 | New | Profinet IO |
Where each product wins
The H2-ERM100 is the stronger fit when you are already tied into the DirectLOGIC DL205 family and want a remote I/O port without changing protocols. The ODOT CN-8032 is the stronger fit when your control network uses Profinet IO and you prefer a fresh unit over an open-box unit.
Product notes
Automation Direct H2-ERM100 / H2ERM100 DirectLOGIC DL205 remote I/O module
The H2-ERM100 is the straightforward choice if you already run a DirectLOGIC DL205 rack. It is the lower-priced option in this head-to-head, and its single Ethernet 10/100Base-T port gives you a remote I/O connection without adding a different protocol layer. The module is compatible with D2-240, D2-250, D2-250-1, D2-260, D2-262 and Do-more H2 series CPUs, so it slots into an existing family. The main limitation is that it is not compatible with the D2-230 CPU or H2-WPLCx-xx units, and it is sold as New - Open box rather than factory-sealed. If you need a DL205 remote I/O module with Ethernet, this is the one to buy.
ODOT Remote I/O Module Profinet IO CN-8032
The ODOT CN-8032 is the higher-priced option, but it addresses a different network: Profinet IO. If your PLC or remote rack communicates over Profinet, this module is the one that speaks that language, and it is a new unit rather than open box. The trade-off is that the higher price and Profinet IO focus mean you are choosing a module for a specific network protocol, not for a named controller family. For a Profinet-based control panel, the CN-8032 is a straightforward new option; if your system is already DirectLOGIC DL205, the H2-ERM100 is the safer match.
Final choice by use case
Choose the Automation Direct H2-ERM100 if you are building or expanding a DirectLOGIC DL205 system with D2-240, D2-250, D2-250-1, D2-260, D2-262 or Do-more H2 CPUs and want remote I/O in that family at the lower price. Choose the ODOT CN-8032 if your control network is Profinet IO and the higher price fits the project. The deciding factor is controller compatibility first, then budget.
