Safety Relay Modules
Compare documented input modes and safety-function requirements for emergency stops, light curtains, guard switches and two-hand controls.
Explore Safety Relay ModulesSafety Relay Modules, Delay Relays, Serial I/O & Micro PLC Modules
DAIDISIKE offers safety relays, delay relays, optocoupler boards, serial I/O modules and micro PLCs for different control-panel tasks. Start by separating the protective safety function from process timing, signal interfacing and programmable sequencing. This catalog helps engineers and buyers reach the appropriate family and then check the exact model's documentation.
For a light curtain, emergency stop or guard device, match its electrical interface and required safety functions to a documented safety-relay configuration. For press or conveyor process control, compare the ordinary timing and I/O options separately. Confirm supply, load, environment and mounting against the ordered model rather than assuming one specification covers the whole range.
- Match safety-device inputs to the exact safety-relay manual.
- Keep protective stop functions separate from ordinary timing and remote I/O.
- Check the model's electrical, environmental and mounting limits.
Key relay & control solutions on this page:
Optocoupler relay modules · single/dual-channel serial I/O · power-on delay relays · trigger delay modules · Ethernet-to-serial communication modules · micro PLC logic modules for compact automation panels.
Optocoupler relay modules · single/dual-channel serial I/O · power-on delay relays · trigger delay modules · Ethernet-to-serial communication modules · micro PLC logic modules for compact automation panels.
Reasons to Select DAIDISIKE Safety Relay & Control Modules
The range covers two distinct design decisions: selecting a documented safety relay for a protective circuit, and selecting ordinary modules for time delay, linkage control, remote operation or serial communication. Optocouplers, timers and the micro PLC can support process-control layouts, but cannot replace the required safety-related logic. Check the individual product for OEM integration or retrofit constraints.
The modules cover a wide range of applications, including safety relay selection for press brake light curtains and power press guarding, delay relay modules for hydraulic presses, conveyors, and motor start/stop sequencing, optocoupler relay I/O modules for PLC/microcontroller isolation and industrial signal interface, Ethernet-to-serial and serial I/O modules for remote monitoring, distributed I/O, and IoT gateways, as well as micro PLC modules for small machine automation, custom control logic, and relay substitution.
Explore the DAIDISIKE relay & control module collection below to find the right fit for your safety circuit, timing control, remote I/O, communication, and small PLC needs.
Industrial Relay and Control Module Categories
Delay Relay Modules
Power-on delay, trigger delay, multi-function timer relay and cyclic timer relay selection.
Explore Delay Relay ModulesModbus I/O Modules
RS485 relay output, digital input, combined I/O and related Ethernet-to-serial gateway modules.
Explore Modbus I/O ModulesMicro PLC Controller
Compact programmable relay logic for non-safety sequencing and small automation systems.
Explore Micro PLC ControllerRelay Modules, Delay Relays, Serial I/O & Micro PLC Lineup
DA31 Safety Relay Module — 22.6 mm, 3 N.O. + 1 N.C.
Compact 22.6 mm dual-channel safety relay with 3 forcibly guided N.O. safety contacts plus 1 N.C. auxiliary, multifunction DIP configuration for documented E-stop, light-curtain, door-interlock and two-hand applications, and <30 ms release time. Match the input settings and wiring to the delivered version.
DQSRN Safety Relay Module — E-Stop, OSSD, Door & Two-Hand
Multi-input safety relay that accepts emergency-stop buttons, light-curtain OSSD pairs, guard-door interlocks and two-hand controls on one unit, with forcibly guided contacts. DQSRN does not provide manual/automatic reset or EDM feedback.
A1J0101 Optocoupler Relay Module
Optocoupler isolation relay output module for PLC, sensor and controller signal switching.
B2J03 Single-Channel Serial Port Input/Output Module
Serial port I/O control, suitable for remote relay, IoT and automation interfacing.
B2J0101 Power-On Delay Relay Module
Power-on delay relay for staged start-up, inrush current limiting and machine protection.
B2J0201 Trigger Delay Module
Trigger-based delay relay for timing control in conveyors, pumps and automated sequences.
B2J0405 Dual-Channel Serial Port Transistor Module
Dual-channel transistor output for serial communication control and remote switching.
B2J0601 General-Purpose Delay Relay Module
Configurable delay relay for versatile industrial timing and automation tasks.
B2J0401 Modbus I/O Module — 4 Analog/Digital In, 2 PWM Out
Modbus RTU module combining four analog/digital inputs with two PWM outputs, for sensor acquisition and proportional control over RS-485.
D2J-0701 Ethernet to Serial Port Module
Ethernet-to-RS485/RS232 converter for remote monitoring and networked I/O systems.
D3J-01xx Modbus I/O Module — RS-485 Digital Input, 4–28 Channels
DIN-rail Modbus RTU digital input modules from 4 to 28 channels, with USB configuration port and RS-485 daisy chaining.
D3J-02XX Modbus Output Module — 2–14 Isolated Outputs
RS-485 Modbus RTU output module with 2–14 isolated relay or transistor outputs and up to two pulse outputs.
D3J-03xx Modbus I/O Module — 2 In / 1 Out up to 12 In / 8 Out
Combined Modbus RTU input/output modules scaling from 2 in / 1 out to 12 in / 8 out, for compact machine control without a full PLC.
E4J-0103 Dual-Channel Delay Linkage Module
Two-channel linkage delay relay for coordinated machine start/stop logic.
E4J0101 Universal Remote Control Delay Relay Module
Remote control delay relay for wireless trigger scenarios in automation.
E4J0102 Clock Measuring Pressure Delay Module
Timer & pressure related delay control for specialized industrial applications.
E4J0206 Micro PLC Module
Compact micro PLC module for small machine automation and relay logic replacement.
17 items · single page
Safety Relay, Delay Relay, Modbus I/O or Micro PLC?
These four device classes look alike on a DIN rail and are constantly mistaken for one another in enquiries. The distinction that matters is not size or price — it is what happens when a part of the module fails. Only the first row below belongs inside a safety function.
| Class | DAIDISIKE models | Use it when | Why it behaves that way |
|---|---|---|---|
| Safety relay module | DA31, DQSRN | A protective circuit whose input device and required safety function match the exact relay's documented configuration. | Safety-related monitoring and output behaviour must be checked against the model manual and validated with the sensor and final switching elements. A safety relay's name alone does not establish suitability for every e-stop, curtain, guard or two-hand circuit. |
| Delay relay module | B2J0101, B2J0201, B2J0601, E4J0101, E4J0102, E4J0103 | Sequencing that is about timing, not safety: staged start-up, inrush limiting, conveyor hand-off, pump run-on, lamp dwell. | Timing and output options serve ordinary process control. These modules are not safety-rated timing elements and must not determine a protective stop or safe restart. |
| Serial / Modbus I/O module | B2J03, B2J0401, B2J0405, D3J-01xx, D3J-02XX, D3J-03xx, D2J-0701 | Getting field signals onto a bus: remote I/O, distributed sensing, IoT gateways, SCADA points far from the panel. | RS-485 Modbus RTU carries field data; D2J-0701 adds an Ethernet-to-serial gateway task. Check the actual communication budget and failure behaviour for ordinary control. These products are not safety I/O. |
| Micro PLC module | E4J0206 | Small machines whose logic outgrew a handful of relays but does not justify a full PLC rack. | Editable, non-safety sequencing can replace interlocked ordinary relays and timers. Confirm the ordered board, enclosure and mounting option separately. |
The one rule that matters: a delay relay, a Modbus I/O module and this micro PLC are ordinary control products, not safety-rated substitutes. A protective circuit needs a documented, suitable safety-related control system. Evaluate the DA31 or DQSRN safety relay only against its exact input, output and required-function documentation, then validate the complete safety function.
Module Demonstration Videos
Eight bench demonstrations from the DAIDISIKE channel, each showing one module being wired, configured and operated. Videos load only when you press play, so they do not slow the page down.
Product page: A1J0101 Optocoupler Relay Module
Product page: B2J0101 Power-On Delay Relay Module
Product page: B2J0201 Trigger Delay Module
Product page: E4J0206 Micro PLC Module
How to Specify a Safety Relay for a Guarded Machine
- Start from the risk assessment, not the catalogue. Establish the required Performance Level for each safety function under ISO 12100 and ISO 13849-1. The relay is one link in that chain; the sensor and the actuator count too.
- Match the relay to the input device. Check the actual contact or electronic-output interface, test signals and wiring requirements. The DQSRN input-mode documentation is a model-specific check, not permission to combine any mix of devices or assume reset and EDM functions are present.
- Count the contacts you need to drive. Three N.O. safety contacts and an N.C. auxiliary do not define the finished circuit by themselves. Allocate safety and status paths according to the manual, checking the load category, minimum switching load and protection for each contact. An auxiliary status path is not a substitute for required contactor monitoring.
- Measure the stopping time. Use the positioning method applicable to the machine and approach geometry. Account for the sensor, logic, final switching elements and measured worst-case machine stopping time, without counting delays already included in the measurement twice. Use documented worst-case response times for the exact devices, not a catalog-wide estimate.
- Check the panel width before you order. Retrofits fail on millimetres more often than on specification. The DA31 is 22.6 mm; confirm the terminal layout against the dimension drawing on the product page.
- Match reset and contactor monitoring to the exact model. Where the risk assessment requires EDM, select a controller with a documented EDM input and wire the contactors' mirror contacts exactly as its manual specifies. DQSRN does not provide EDM or manual/automatic reset, so those functions must not be assigned to it.
Relay & Control Module FAQ
Which relay module should I use with a safety light curtain?
Use an appropriate safety relay — such as the DA31 or DQSRN where its documented OSSD input mode matches the curtain — not a delay or I/O module. A light curtain's OSSD pair cannot drive a contactor coil directly. EDM and reset functions are model-specific: DQSRN does not provide manual/automatic reset or EDM feedback, so do not specify those functions for it. Where the risk assessment requires EDM or monitored reset, select a controller that explicitly documents those functions and validate the complete circuit.
What is the difference between a safety relay and an ordinary delay relay?
The distinction is the documented safety function and fault behaviour, not merely the presence of a timer or relay contacts. Ordinary delay modules provide process timing and must not determine a protective stop or safe restart. A safety relay must be selected and wired according to its documented input, output and monitoring functions, then validated as part of the complete circuit. An auxiliary status contact alone is not proof that every dangerous fault is detected.
Can DAIDISIKE relay modules be used for press brake and power press retrofits?
Only after confirming that the press and its stopping system are eligible for the proposed safeguarding method. DA31 or DQSRN may be considered where the exact documented input mode, output circuit and required functions match the machine. Keep ordinary delay modules in process sequencing, not in protective stop timing. Determine the separation distance using the applicable machine requirements and positioning method, with a measured worst-case stopping time and all safety-path response times included without double counting.
What are typical applications for delay relay modules?
Staged start-up so several motors do not draw inrush current simultaneously; conveyor hand-off timing; pump and fan run-on after a stop command; discharge delay on capacitive loads; lamp and solenoid dwell. The B2J0101 delays after power is applied, the B2J0201 delays from an external trigger, and the B2J0601 offers multiple selectable modes when one board has to cover several timing behaviours.
When do I need a Modbus I/O module instead of hard-wiring?
When distributed ordinary I/O makes parallel signal wiring impractical. Allow separately for power, signal reference, shielding and the actual RS-485 installation requirements; a bus does not eliminate every other conductor. Check polling time, update rate, timeouts and output behaviour after communication loss against the process needs. These ordinary Modbus modules must not carry the protective safety function; that requires an appropriately specified and validated safety-related control system.
What is the difference between the D3J-01xx, D3J-02XX and D3J-03xx series?
Channel direction. D3J-01xx are input-only modules, from 4 up to 28 digital input channels. D3J-03xx combine inputs and outputs on one board, scaling from 2 in / 1 out to 12 in / 8 out. D3J-02XX provides 2 to 14 outputs depending on the order code. Confirm each model's electrical interface, register map, bus settings and ordered mounting option before combining modules on a Modbus RTU network.
When should I choose a micro PLC module over a stack of relays?
Consider E4J0206 when ordinary sequencing needs editable logic, interacting conditions or frequent changes that fixed timer modes do not cover conveniently. Compare the actual I/O, program requirements, panel space and maintenance needs rather than using a fixed relay-count threshold. Keep the protective safety function outside this non-safety micro PLC; ordinary programmable logic is not a substitute for a safety-related controller.
Do these modules carry a Performance Level or SIL rating?
The DA31 factory brochure states EN ISO 13849-1 Category 4, and its product label references PL e and IEC 62061 SIL 3. These are manufacturer claims, not independent certification verified by this page. DQSRN separately lists Category 4 / PL e as a design reference and IEC 61508 SIL 3 as a technical reference. The achieved safety function depends on the complete sensor, logic and actuator chain. Obtain the supporting documents for the exact model and configuration; company quality-system certification does not establish a product's PL or SIL. The delay, I/O and micro PLC modules carry no safety rating and must not be used for the protective stop function.
What supply voltages, panel width and mounting do these modules use?
The safety-relay housings mount on standard 35 mm DIN rail. B2J and E4J automation modules can be ordered as bare boards or with enclosure and DIN-rail mounting options, so rail mounting is not universal. Supply voltage, width and terminal layout vary by model and configuration; confirm the ordered enclosure and dimensions before finalising the panel layout.
What are the MOQ, lead time and OEM options?
MOQ is low — single units are accepted for sampling and panel validation. Typical lead time is 3–15 days depending on series and volume. OEM options include private labelling, factory-fixed communication parameters, and deleting unused terminals, buttons or LEDs to trim unit cost on volume orders. Certificate of Origin (CO) and Form E can be issued with the shipment for ASEAN buyers claiming the ACFTA preferential tariff.