DAIDISIKE offers an extensive selection of modules designed to enhance machine safety and industrial automation, including safety relays, delay relays, optocoupler boards, serial I/O modules, and micro PLCs. These components are utilized to construct dependable dual-channel safety circuits for various applications, such as safety light curtains, emergency stops, press brake guarding, and electro-sensitive protective equipment. This resource is tailored to meet the needs of engineers and buyers seeking specific solutions, including relays for light curtains, delay modules for presses, and optocoupler I/O modules.
The modules support a range of safety devices, including light curtains, photoelectric protectors, door locks, and safety mats, making them suitable for press brake and power press retrofits, conveyor safety, and remote IO control. With their industrial-grade design, these modules ensure stable performance even in challenging environments.
These modules are specifically designed to connect with safety light curtains, emergency stop buttons, limit switches, and sensors. They aid users in establishing dual-channel, monitored safety circuits that align with contemporary safety principles. The options include relays, optocouplers, and PLC-based systems for creating adaptable control panel layouts. They cater to various needs such as time delay, linkage control, remote operation, and serial communication. With their compact sizes, they are well-suited for both original equipment manufacturer integration and retrofitting projects.
The modules cover a wide range of applications and niche search scenarios, including safety relay modules 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.
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 | Any circuit whose job is to stop a hazard: e-stop, light-curtain OSSD, guard-door interlock, two-hand control. | Forcibly guided (positively driven) contacts and dual-channel monitoring mean a welded contact becomes detectable instead of failing silently. This is the only class in the table that belongs in a safety function. |
| 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. | Ordinary relay contacts with a timer. Cheap, compact and easy to set — but no fault detection, so never place one inside a safety chain. |
| 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 (or Ethernet on the D2J-0701) replaces long parallel wiring runs with one twisted pair. Adds latency, so it suits monitoring and non-time-critical control. |
| Micro PLC module | D4G0206, E4J0206 | Small machines whose logic outgrew a handful of relays but does not justify a full PLC rack. | Programmable sequencing in a DIN-rail package. Replaces a nest of interlocked relays and timers with editable logic. |
The one rule that matters: a delay relay, a Modbus I/O module and a micro PLC have ordinary contacts and no fault detection. If one of their contacts welds shut, nothing notices. Never place them in a circuit whose job is to stop a hazard — that circuit needs a DA31 or DQSRN safety relay with forcibly guided contacts.
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: D4G0206 Micro PLC Programmable Module
Use a safety relay — the DA31 or the DQSRN — not a delay or I/O module. A light curtain's OSSD pair is a pair of transistor outputs; it cannot drive a contactor coil directly, and it needs a device that monitors both channels for discrepancy. The safety relay does both: it multiplies the two OSSD channels into three forcibly guided N.O. contacts rated for contactor loads, and it detects a welded contact instead of letting the fault stay hidden. Enable EDM (external device monitoring) so the relay also supervises the contactors it drives.
Fault behaviour, not timing. An ordinary delay relay has plain contacts and a timer: if a contact welds shut, nothing notices and the machine keeps running with no protection. A safety relay uses forcibly guided (positively driven) contacts, so its N.O. and N.C. contacts are mechanically linked and can never be closed at the same time — a welded safety contact is revealed by the auxiliary contact. Only the safety relay belongs inside a safety function; the delay relay belongs in sequencing.
Yes. A typical press retrofit pairs a safety light curtain or photoelectric protector with a DA31 or DQSRN safety relay driving the clutch/brake contactors, and often a delay relay for run-on or staged start-up. Size the guarding distance with ISO 13855 using the curtain's response time plus the relay's release time (under 30 ms) plus the press's own stopping time, measured with a calibrated stop-time meter rather than taken from the machine plate.
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 the distance or the point count makes parallel wiring impractical. An RS-485 Modbus RTU trunk carries many I/O points on one twisted pair, so a remote sensing station 200 m from the panel needs two conductors instead of forty. The trade-off is latency: bus polling adds tens of milliseconds, which is fine for level, pressure and status monitoring but wrong for anything time-critical — and never acceptable for a safety function, which must stay hard-wired through a safety relay.
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. The D3J-02XX family is the output side of the same platform. All three share the RS-485 Modbus RTU interface, the USB configuration port and 35 mm DIN mounting, so they mix freely on one trunk.
Roughly when the logic passes four or five interlocked relays and timers. At that point a D4G0206 micro PLC is smaller, cheaper and — more importantly — editable: a sequence change becomes a software edit instead of a rewiring job. Keep the safety function outside it. Programmable logic is not a substitute for a safety relay unless the device is a certified safety PLC, which these modules are not.
The DA31 and DQSRN are designed with EN ISO 13849-1 Category 4 / PL e and IEC 61508 SIL 3 as their functional-safety design references, and DAIDISIKE products are CE marked and built under an ISO 9001 quality system. The level actually achieved by a safety function always depends on the complete chain — sensor, logic and actuator — not on the relay alone. Request the current certification documents from the factory before specifying a rated safety function. The delay, I/O and micro PLC modules carry no safety rating and must not be used in one.
All mount on standard 35 mm DIN rail. The safety relays run on DC 24 V, with the DA31 at 22.5 mm wide — usually the deciding factor in a crowded retrofit panel. The delay and I/O ranges offer 5, 9, 12, 18 and 24 VDC versions depending on model. Confirm the exact width and terminal layout against the dimension drawing on each product page before finalising the panel layout.
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.