Siemens LOGO! DM16 24R
The LOGO! DM16 24R is positioned as a market-leading expansion relay module because it delivers a high channel count in a compact DIN-rail form factor with seamless integration into the LOGO! logic family, making it cost-efficient on a per-channel basis for mid-sized control tasks. Compared with the other modules listed, Siemens stands out for broad ecosystem compatibility and supply-chain maturity, offering lower total system engineering and procurement cost when you need many relay outputs tightly integrated with LOGO! controllers.
Compact footprint
Snap-on satisfaction
Compact footprint
Snap-on satisfaction
Review Summary
"Users report solid reliability and seamless integration with LOGO! PLCs, with clear wiring and stable relay outputs. Some note it is pricier than generic alternatives."
Industrial-grade reliability
16 relay outputs compatible with Siemens LOGO! controllers for seamless expansion
Industrial-grade reliability
16 relay outputs compatible with Siemens LOGO! controllers for seamless expansion
Time-Saving Convenience
Increased Safety & Security
The LOGO! DM16 24R is positioned as a market-leading expansion relay module because it delivers a high channel count in a compact DIN-rail form factor with seamless integration into the LOGO! logic family, making it cost-efficient on a per-channel basis for mid-sized control tasks. Compared with the other modules listed, Siemens stands out for broad ecosystem compatibility and supply-chain maturity, offering lower total system engineering and procurement cost when you need many relay outputs tightly integrated with LOGO! controllers.
Compact footprint
Snap-on satisfaction
Industrial-grade reliability
16 relay outputs compatible with Siemens LOGO! controllers for seamless expansion
24 V DC supply and direct bus connection to LOGO! units
Compact footprint
Snap-on satisfaction
Industrial-grade reliability
16 relay outputs compatible with Siemens LOGO! controllers for seamless expansion
24 V DC supply and direct bus connection to LOGO! units
$200-300 USD
Schneider Electric Zelio Logic SR3XT141BD
The Zelio Logic SR3XT141BD is best-in-class for users who want a compact smart-relay approach to I/O expansion with very user-friendly programming and attractive pricing for small automation projects. Against the other products, Schneider's strength is simplified configuration and low upfront project cost for standalone or lightly networked expansion needs, sacrificing some channel density in exchange for ease of use and rapid commissioning.
Modular expandability
Intuitive programming (no-fuss)
Modular expandability
Intuitive programming (no-fuss)
Review Summary
"Buyers praise its ease of programming and dependable performance for compact automation tasks. Critics cite limited scalability and a higher price compared with basic PLC alternatives."
Energy-efficient operation
Designed for Schneider Zelio Logic to add relay outputs without changing the CPU
Energy-efficient operation
Designed for Schneider Zelio Logic to add relay outputs without changing the CPU
Time-Saving Convenience
Skill Development & Mastery
The Zelio Logic SR3XT141BD is best-in-class for users who want a compact smart-relay approach to I/O expansion with very user-friendly programming and attractive pricing for small automation projects. Against the other products, Schneider's strength is simplified configuration and low upfront project cost for standalone or lightly networked expansion needs, sacrificing some channel density in exchange for ease of use and rapid commissioning.
Modular expandability
Intuitive programming (no-fuss)
Energy-efficient operation
Designed for Schneider Zelio Logic to add relay outputs without changing the CPU
High-density I/O in a small footprint to save panel space
Modular expandability
Intuitive programming (no-fuss)
Energy-efficient operation
Designed for Schneider Zelio Logic to add relay outputs without changing the CPU
High-density I/O in a small footprint to save panel space
$150-250 USD
ABB CR-M024DC4L
The CR-M024DC4L earns its place as a rugged relay expansion option thanks to a design focused on electrical endurance and reliability for heavy switching loads, which makes it financially attractive over the lifecycle in applications where failure or replacement is costly. Compared with the higher-density or more integrated modules from Siemens and Omron, ABB provides a conservative, durable choice—fewer channels but lower long-term maintenance and replacement expenses for demanding loads.
High channel density
Extended coil lifespan
High channel density
Extended coil lifespan
Review Summary
"Long-term users highlight excellent build quality, long life and consistent switching performance in industrial settings. Main negatives are higher cost and occasional supply lead times."
Vibration-resistant (tank-like)
Four changeover relay outputs with 24 V DC coil for straightforward expansion tasks
Vibration-resistant (tank-like)
Four changeover relay outputs with 24 V DC coil for straightforward expansion tasks
Increased Safety & Security
Time-Saving Convenience
The CR-M024DC4L earns its place as a rugged relay expansion option thanks to a design focused on electrical endurance and reliability for heavy switching loads, which makes it financially attractive over the lifecycle in applications where failure or replacement is costly. Compared with the higher-density or more integrated modules from Siemens and Omron, ABB provides a conservative, durable choice—fewer channels but lower long-term maintenance and replacement expenses for demanding loads.
High channel density
Extended coil lifespan
Vibration-resistant (tank-like)
Four changeover relay outputs with 24 V DC coil for straightforward expansion tasks
Slim DIN-rail housing and straightforward screw terminals for fast wiring
High channel density
Extended coil lifespan
Vibration-resistant (tank-like)
Four changeover relay outputs with 24 V DC coil for straightforward expansion tasks
Slim DIN-rail housing and straightforward screw terminals for fast wiring
$80-160 USD
Omron G2RV-SR700
The G2RV-SR700 is notable as a high-density, serviceable relay expansion module that emphasizes fast field replacement and modular sockets, reducing downtime and labor costs in maintenance-heavy installations. Relative to the others, Omron balances channel density and maintainability—offering quicker swap-outs than integrated smart-relays like Schneider’s and better field-servicing economics than some compact but soldered designs.
Blinky status LEDs
Quick, repeatable switching
Blinky status LEDs
Quick, repeatable switching
Review Summary
"Widely regarded as reliable and fast-acting with good contact durability for repeated use. Some users mention audible relay noise and a premium price versus commodity relays."
Space-saving powerhouse
Modular relay block system allowing multiple plug-in relays for scalable channel counts
Space-saving powerhouse
Modular relay block system allowing multiple plug-in relays for scalable channel counts
Time-Saving Convenience
Increased Safety & Security
The G2RV-SR700 is notable as a high-density, serviceable relay expansion module that emphasizes fast field replacement and modular sockets, reducing downtime and labor costs in maintenance-heavy installations. Relative to the others, Omron balances channel density and maintainability—offering quicker swap-outs than integrated smart-relays like Schneider’s and better field-servicing economics than some compact but soldered designs.
Blinky status LEDs
Quick, repeatable switching
Space-saving powerhouse
Modular relay block system allowing multiple plug-in relays for scalable channel counts
Individual LED and mechanical status indicators for each relay channel
Blinky status LEDs
Quick, repeatable switching
Space-saving powerhouse
Modular relay block system allowing multiple plug-in relays for scalable channel counts
Individual LED and mechanical status indicators for each relay channel
$180-320 USD
Phoenix Contact PLC-RSC-24DC/21
The PLC-RSC-24DC/21 from Phoenix Contact is a compact, well-engineered expansion relay module prized for its terminal technology, electrical isolation and straightforward integration into industrial control panels, delivering predictable performance with low installation time. When compared to the other options, Phoenix Contact offers a middle ground: cleaner wiring and strong industrial IO practices that translate into lower installation labor and fewer wiring errors, although it may not match Siemens in raw channel-per-module density.
Exceptional electrical isolation
Secure screw terminals
Exceptional electrical isolation
Secure screw terminals
Review Summary
"Customers appreciate robust construction, secure DIN-rail mounting and clear wiring documentation, delivering dependable long-term performance. A few buyers find it relatively expensive but worth it for reliability."
Robust DIN-rail armor
Relay module designed for PLC expansion with 24 V DC coils and multiple output points
Robust DIN-rail armor
Relay module designed for PLC expansion with 24 V DC coils and multiple output points
Increased Safety & Security
Time-Saving Convenience
The PLC-RSC-24DC/21 from Phoenix Contact is a compact, well-engineered expansion relay module prized for its terminal technology, electrical isolation and straightforward integration into industrial control panels, delivering predictable performance with low installation time. When compared to the other options, Phoenix Contact offers a middle ground: cleaner wiring and strong industrial IO practices that translate into lower installation labor and fewer wiring errors, although it may not match Siemens in raw channel-per-module density.
Exceptional electrical isolation
Secure screw terminals
Robust DIN-rail armor
Relay module designed for PLC expansion with 24 V DC coils and multiple output points
High isolation and surge protection suitable for harsh industrial environments
Exceptional electrical isolation
Secure screw terminals
Robust DIN-rail armor
Relay module designed for PLC expansion with 24 V DC coils and multiple output points
High isolation and surge protection suitable for harsh industrial environments
$120-220 USD