Allen Bradley 1734 series POINT I/O common terminal module and voltage terminal module

Allen Bradley 1734 series POINT I/O common terminal module and voltage terminal module

Core framework and scope of application

The document follows the logical mainline of "safety regulations → installation process → wiring guidance → technical parameters", covering the entire process of module preparation to deployment. The applicable products are two types of terminal modules in the 1734 series:

Common Terminal Module (1734-CTM/CTMK): Used to expand the common terminal wiring capability of POINT I/O modules, supporting centralized management of common lines for 8-channel high-density I/O modules. The suffix "K" is the conformal coating version (moisture-proof/corrosive environment), with specifications consistent with the uncoated version.

Voltage Terminal Module (1734-VTM/VTMK): Provides voltage output terminals to distribute power to field devices such as sensors and actuators, and also supports 8-channel configuration. The "K" version is a conformal coating version.

Applicable scenarios: In industrial automation control systems, it is used in conjunction with 1734 series POINT I/O modules (such as digital input/output modules, analog modules) to solve terminal expansion and power distribution problems in high-density wiring scenarios. It is compatible with 1734-TB/TBS (two-piece terminal base) and 1734-TOP/TOPS (one-piece terminal base), but not compatible with 1734-TB3/TB3S and 1734-TOP3/TOP3S bases.

Core content sorting

（1） Preparation in advance: Safety regulations and environmental requirements

Safety prerequisite

Operation qualification: Installation, wiring, and maintenance must be carried out by trained professionals and comply with local electrical regulations (such as NFPA 70E, EN/IEC standards).

Static electricity protection: The module is sensitive to static electricity. When operating, it is necessary to touch a grounded object to discharge and wear a grounding wristband. It is forbidden to touch the pins or components of the circuit board. When idle, it should be stored in anti-static packaging.

Attention to hazardous environments: If used in Class I, Zone 2 hazardous areas, it must be installed in a compliant enclosure and the wiring method must meet local explosion-proof standards; When replacing modules or terminals, power off or ensure that the environment is not hazardous.

Environmental and shell requirements

Environmental level: Suitable for industrial environments with pollution level 2, overvoltage category II (EN/IEC 60664-1), altitude up to 2000 meters (no need to downgrade), prohibited for residential environments.

Shell requirements: The module is of open design and needs to be installed inside a closed shell. The shell should have flame retardant properties (flame propagation level 5VA or non-metallic materials need to be certified), and the interior can only be accessed through tools. The protection level should refer to NEMA 250 or EN/IEC 60529 standards (such as dustproof and waterproof requirements).

Temperature range: Operating temperature -20 ° C~+55 ° C (-4 ° F~+131 ° F), non operating temperature -40 ° C~+85 ° C (-40 ° F~+185 ° F). Exceeding this range can cause module failure.

（2） Installation process: Base, module, and terminal block deployment

1. Install the terminal base (Mounting Base)

The module needs to be installed on a DIN rail through a 1734-TB/TBS or 1734-TOP/TOPS terminal base (recommended Allen Bradley 199-DR1 rail, compliant with EN 50022 standard). The steps are as follows:

Rail grounding confirmation: Use galvanized chromate passivated steel rails (aluminum/plastic rails are prone to oxidation or poor conductivity, which can cause grounding abnormalities), fix the rails every 200mm (7.8 inches), and install end anchors at both ends. Grounding must comply with the Industrial Automation Wiring and Grounding Guidelines (1770-4.1).

Positioning and installation of the base: Align the base vertically with the installed equipment (adapter, power supply, or existing module), slide down to engage the side interlocking structure with adjacent equipment, and press until the buckle is locked; Confirm that the orange DIN rail locking screw is in a horizontal position (unlocked) to prevent the base from loosening.

End cap protection: The end cap of the terminal base should be covered with an adapter or interface module to prevent electric shock or equipment damage to the exposed interconnected parts.

2. Install terminal module

The module can be deployed before or after installation on the base, and the key steps are as follows:

Base key switch configuration: Use a Phillips screwdriver to rotate the orange key switch on the base clockwise to align the corresponding module type number with the base groove (default position 1, refer to the module label for details), ensuring correct mechanical positioning.

Module installation: Insert the module vertically into the base and press it until the locking buckle is engaged; If the base is powered on, inserting/removing the module may generate an arc. In hazardous environments, power should be cut off first to avoid explosions caused by the arc.

3. Install Removable Terminal Block (RTB)

Module matching 1734-RTB (detachable terminal block), supports wire free replacement of base, installation steps:

Terminal block positioning: Insert the RTB handleless end (with arc-shaped buckle) into the base and rotate it to lock (hear a "click" sound).

Handle fixation: If the I/O module has been installed, fasten the RTB handle onto the module to ensure that the terminal block is stable; When disassembling, simply pull the handle upwards without removing the wiring.

Special terminal block operation:

1734-RTBS/RTB3S: Use a 3mm diameter screwdriver (1492-N90) to insert into the opening at a 73 ° angle and gently push up to lock/unlock the wiring.

1734-TOPS/TOP3S: Insert the screwdriver into the opening at a 97 ° angle to avoid damaging the terminals.

（3） Wiring guidance: Terminal definition and typical scenarios

The module needs to be used in conjunction with POINT I/O modules, and the wiring needs to be disconnected first. The key specifications are as follows:

1. Terminal definition

1734-CTM (Common Terminal Module): The terminals are divided into "Common 0-7", corresponding to the common end of the 8-channel I/O module (such as the power common line of the digital module), which centrally manages the common line and reduces wiring redundancy.

1734-VTM (Voltage Terminal Module): The terminals are divided into "Voltage out 0~7" (voltage output) and "Common 0~7" (common terminal), providing power distribution for on-site equipment. The output voltage needs to be matched with an external power source (10~28.8V DC or 120/240V AC).

2. Typical wiring scenarios

The document provides wiring diagrams for four core scenarios (Figures 4 to 7), with key examples as follows:

Leakage type input wiring (1734-IB8 module+CTM/VTM): The "signal terminal" of the 2-wire/3-wire proximity sensor is connected to the input terminal of the I/O module, the "power terminal" is connected to the "Voltage out" of the VTM, and the "common terminal" is connected to the "Common" of the CTM, achieving separate management of power and common terminals.

Source type output wiring (1734-OB8 module+CTM): The "positive pole" of the actuator (such as indicator lights, relays) is connected to the output terminal of the I/O module, and the "negative pole" is centrally connected to the "Common" of the CTM, simplifying multi device common terminal wiring.

Universal wiring (adapter+CTM/VTM): VTM connects to an external power source to distribute voltage to other devices; CTM connects to the adapter's common end, achieving the aggregation of multiple module common lines and avoiding duplicate wiring.

3. Wiring parameters

Wire specifications: Supports solid or stranded copper wire of 0.25~2.5mm ² (22~14 AWG), with a maximum insulation thickness of 1.2mm (3/64 inches), and a rated temperature of ≥ 75 ° C (167 ° F).

Terminal torque: The tightening torque of the base screw is 0.8 N · m (7 lb · in), excessive tightening can damage the terminal.

（4） Technical parameters: Electrical and environmental specifications

1. General parameters

Parameter values

No indicator light

Key switch position 5

Adaptation base 1734-TB/TBS, 1734-TOP/TOPS

POINT Bus maximum current none

Maximum power consumption/heat dissipation none (only terminal expansion, no active components)

Isolation voltage 250V AC (continuous), 1600V DC (60 second test, on-site system side)

On site power bus voltage 10~28.8V DC, 120/240V AC

The maximum output current of the on-site power bus is 2A per point and 4A per module

The dimensions (height x width x depth) are approximately 56.6 x 12.1 x 77.5mm (2.23 x 0.48 x 3.05 inches)

Weight approximately 30.9g (1.09 ounces)

2. Environmental parameters

Parameter standards and numerical values

Working temperature -20 ° C~+55 ° C (-4 ° F~+131 ° F), in accordance with IEC 60068-2-1/2/14

Non working temperature -40 ° C~+85 ° C (-40 ° F~+185 ° F), in accordance with IEC 60068-2-1/2/14

Relative humidity of 5%~95% (non condensing), in accordance with IEC 60068-2-30

Vibration (working) 5g @ 10~500Hz, in accordance with IEC 60068-2-6

Impact (working) 30g, compliant with IEC 60068-2-27

50g impact (non working), in accordance with IEC 60068-2-27

3. Authentication information

C-UL-US certification: UL listed industrial control equipment, suitable for the United States and Canada; Certification for Class I Zone 2 (Groups A/B/C/D) Hazardous Areas (UL Document E194810).

UK and CE certification: VTM/VTMK complies with UK Regulation 1101 of 2016 and EU EMC Directive 2014/35/EU (EN 61131-2); All modules comply with the EU 2011/65/EU RoHS Directive (EN IEC 63000).

Moroccan certification: VTM/VTMK complies with Moroccan Ministerial Decree No. 6404-15.

（5） Module dismantling and maintenance

Dismantling process: The module, adjacent module on the right side, and RTB (if wired) need to be dismantled first. The steps are:

Disconnect the RTB handle buckle and pull out the RTB;

Press the lock button on the top of the module and pull out the module;

Use a Phillips screwdriver to rotate the orange base locking screw to a vertical position, release the locking mechanism, and lift the base upwards to complete the removal.

Maintenance precautions: Do not disassemble the module by yourself in case of a malfunction and return it to the manufacturer for repair; When cleaning, only dry anti-static cloth can be used for wiping, and the use of cleaning agents is prohibited.