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Single Stack Light Monitoring Module with Ethernet/RS-485 Interface and PoE for DC Stack Lights. (4 DC DI + 1 Relay)


Single Stack Light Monitoring Module with Ethernet/RS-485 Interface and PoE for DC Stack Lights. (4 DC DI + 1 Relay)

  Price:  $189.00  

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References & Support


The tSL-P4R1/tSL-PA4R1 is a stack light monitoring, 4-channel DC/AC digital input and 1-channel relay output module. The tSL-P4R1/tSL-PA4R1 monitors the status of the stack light of the MES (Manufacturing Execution System) machine. The tSL-P4R1/tSL-PA4R1 can also detect the status of each color segment of the stack light as being either OFF, ON, or flashing. In addition to detecting the status of each individual color segment, the status of the combination of multiple color segments can also be defined, including the ability to report the duration of the previous status. By integrating the tSL-P4R1/tSL-PA4R1 module into your system, it is easy to implement stack light status monitoring on an MES via SCADA software to improve machine utilization and throughput. By installing the tSL-P4R1/tSL-PA4R1 intelligent module, the module monitors the output of the machine’s indicators without affecting the operation of the equipment, allowing the current operation stage of the machine to be mastered and ensuring timely command of the logistics system support in order to achieve production goals. By managing the machine status, it reduces the amount of downtime and to reduce production costs.

  • Able to detect the status of each color segment: ON, OFF, or Flashing.
  • 4-channel DC/AC digital input and 1-channel alarm relay output.
  • Status monitoring for user-defined combinations of multiple color segments.
  • Reports the duration of the previous status
  • Supports Modbus RTU, Modbus TCP and MQTT protocols.
  • Includes RS-485/Ethernet communication interfaces.
  • Includes redundant power inputs: PoE (IEEE 802.3af, Class 1) and DC input.
  • Web-based configuration interface and firmware update via Ethernet.
  • Relay output for alarm devices.
  • Wide operating temperature range: -25 to +75°C.


Factory Automation, Machine Automation, Remote Maintenance, Remote Diagnosis and Testing Equipment.

connections application


Software Specifications


RS-485 Port

Baud Rate = 1200 ~ 115200 bps

Ethernet Port

10/100 Base-TX, 8-Pin RJ-45 x1 (Auto-negotiating, Auto-MDI/MDIX, LED indicators)


IP filter (whitelist) and Password (web)


Modbus/RTU, Modbus TCP and MQTT

Dual Watchdog

Yes, Module (2.3 seconds), Communication (Programmable)

LED Indicators


System indicator


PoE indicator (Green), Link/Act,(Yellow)


Intra-module Isolation, Field-to-Logic

3750 VDC

EMS Protection

ESD (IEC 61000-4-2)

±4 kV Contact for Each Terminal,±8 kV Air for Random Point

EFT (IEC 61000-4-4)

±2 kV for Power

Power Requirements

Reverse Polarity Protection


Power Input

Terminal Block: +10 ~ +48 VDC, PoE: IEEE 802.3af, Class 1


PoE=1 W Max. , Non-PoE= 0.9 W Max.


Dimensions (W x L x H)

52 mm x 98 mm x 27 mm


DIN-Rail Mounting


Operating Temperature

-25 to +75°C

Storage Temperature

-30 to +80°C


10 to 95% RH, Non-condensing

I/O Specifications

Digital Input

Input Channels



Wet Contact (Sink, Source)

ON Voltage Level

+10 VDC ~ 50 VDC

OFF Voltage Level

+4 V Max.

Input Impedance

10 KΩ, 0.5 W

Programmable Digital Filter

0 ~ 6500 ms

Max. Stack Light Flashing Speed

3 kHz

Able to detect the status of each color segment: ON, OFF, or Flashing


Status monitoring for user-defined combinations of multiple color segments

Max. 81 combinations

Report duration of previous status

Yes, 10 ~ 65500 ms

Overvoltage Protection

70 VDC


3750 VDC

Digital Output

Output Channels



Power Relay, Form A (SPST N.O.)

Operating Voltage Range

250 VAC or 30 VDC

Max. Load Current

5 A

Operate Time

6 ms

Release Time

3 ms

Electrical Life (Resistive load)

VDE= 5 A @ 250 VAC 30,000 ops (10 ops/minute) at 75°C, 5 A @ 30 VDC 70,000 ops (10 ops/minute) at 75°C

Electrical Life (Resistive load)

UL=5 A @ 250 VAC/30 VDC 6,000 ops ,3 A @ 250 VAC/30 VDC 100,000 ops

Mechanical Life

20,000,000 ops at no load (300 ops/minute)

Power-on Value

Yes, Programmable

Safe Value

Yes, Programmable

References and Support

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