Allen-Bradley 1734-IE4S Safety Analog Input Module

Product Introduction

The Allen-Bradley 1734-IE4S is a versatile Safety Analog Input Module engineered for the POINT I/O system. This module provides four single-ended inputs configurable for voltage, current, or tachometer signals. For instance, you can use it to monitor pressure, temperature, flow, or rotational speed in safety-critical loops. Furthermore, its 12-bit ADC resolution ensures accurate signal conversion. Meanwhile, the compact design saves valuable space within your control cabinet. Overall, this module offers exceptional flexibility for diverse analog sensing applications.

Technical Specifications

This section details the core technical capabilities of the 1734-IE4S module.

Input Characteristics

The 1734-IE4S accepts up to four single-ended analog inputs. Specifically, you can configure each channel independently for different signal types. Therefore, this flexibility allows seamless integration with various field sensors. Moreover, the module supports unipolar mode for all input types, simplifying configuration. First, for voltage inputs, the module handles 0-10V and 0-5V ranges. Second, for current inputs, it supports both 0-20 mA and 4-20 mA standards. Third, a dedicated tachometer mode accepts frequency inputs from 1 Hz to 1000 Hz. Consequently, the 1734-IE4S adapts to nearly any analog sensing requirement found in industrial environments.

• Inputs: 4 single-ended per module

• Input Type: Voltage, Current, or Tachometer

• Modes: Unipolar

• ADC Resolution: 12 bits

Signal Ranges and Fault Thresholds

Precise fault detection is essential for safety applications. Thus, the 1734-IE4S incorporates clearly defined overrange and underrange thresholds. For voltage signals, the overrange threshold is 10.0V for the 0-10V range and 5.0V for the 0-5V range. Likewise, the underrange threshold is 0.5V for the 0-10V range and 0.25V for the 0-5V range. For current signals, the overrange threshold is 20.0 mA for both 0-20 mA and 4-20 mA configurations. Meanwhile, the underrange threshold is 0.5 mA for the 0-20 mA range and 4.0 mA for the 4-20 mA range. Additionally, the tachometer mode has a frequency range of 1 to 1000 Hz and an overrange threshold of 1 kHz. These thresholds enable prompt fault identification and effective system response.

Digital Code Ranges

The 1734-IE4S converts analog signals into digital values for processing by a controller. In unipolar voltage mode, the code range spans from 0 to 32767. For the 4-20 mA current input, the code range extends from -8192 to 32767. Finally, the tachometer mode provides a code range of 0 to 1000. These ranges ensure straightforward compatibility with standard PLC and safety controller configurations. Furthermore, the consistent scaling simplifies engineering and reduces setup time.

Power and Isolation Features

The sensor power outputs on the 1734-IE4S are individually current-limited and actively monitored. This design protects both the module and connected sensors from overcurrent conditions. However, when using more than one external power source with this module, you must not exceed its specified maximum isolation voltage. Therefore, always verify your system's power configuration against the module's datasheet to prevent unexpected damage or performance degradation.

Operational Modes and Safety Functions

The 1734-IE4S supports a dual-channel equivalent mode to enhance system safety. To utilize this feature, first configure the module for single-channel operation. Subsequently, the analog input pairs will be evaluated as matched pairs. For example, you can connect two independent sensors monitoring the same process variable. Then, the module compares their readings and generates a fault if they deviate beyond a set tolerance. Consequently, this mode helps you achieve higher Safety Integrity Levels (SIL) for your application. Therefore, the 1734-IE4S is well-suited for demanding safety instrumented functions.

Mechanical and Environmental Parameters

The 1734-IE4S is built to withstand demanding industrial environments. Its operating temperature range is -20 to 55 °C (-4 to 131 °F). Furthermore, the storage temperature range extends from -40 to 85 °C (-40 to 185 °F). Additionally, the module tolerates relative humidity from 5% to 95% (non-condensing). The open-style enclosure provides adequate cooling while maintaining protection against typical industrial contaminants. Moreover, its DIN-rail mounting system simplifies installation and replacement. Overall, these parameters ensure reliable performance across a wide range of factory and process automation settings.

• Mounting: DIN rail mountable

• Enclosure Type: Open style

• Operating Temperature: -20 to 55 °C (-4 to 131 °F)

• Storage Temperature: -40 to 85 °C (-40 to 185 °F)

• Relative Humidity: 5 to 95% (non-condensing)

Installation Guidelines

Proper installation of the 1734-IE4S ensures reliable operation and optimal performance. First, mount the module securely onto the DIN rail by snapping it into place. Next, connect your field sensors to the removable terminal blocks using appropriate gauge wiring. Then, insert the terminal blocks into the module's front connectors. After wiring, use your configuration software to set the input type and operating mode for each channel. Finally, verify all connections and apply power to the system. During initial power-up, the module performs a self-diagnostic routine. Additionally, always ensure that the system power is completely off before starting any installation or maintenance work to protect both personnel and equipment.

Packaging List

When you receive your new 1734-IE4S, the package will contain the following items. Please inspect the contents immediately upon delivery.

• 1 x Allen-Bradley 1734-IE4S Safety Analog Input Module

• 1 x Removable Terminal Block (with screw connections)

• Installation instructions and configuration notes

Note: The module ships as a single unit. All necessary mounting hardware for DIN rail installation is included. No interconnecting cables or additional accessories are provided.

Shipping Information
We ship all orders using premium, trackable carriers such as Fedex, UPS, and DHL. A tracking number will be emailed to you promptly after dispatch.

Frequently Asked Questions (FAQ)

Q1: Can the 1734-IE4S module be used with both 2-wire and 4-wire transmitters?
A1: Yes, the 1734-IE4S module can interface with both 2-wire and 4-wire transmitters. However, the wiring connections differ significantly between the two types. Therefore, consult the installation manual for the correct terminal assignments before wiring to ensure proper operation.

Q2: What exactly does the dual-channel equivalent mode do on the 1734-IE4S?
A2: This safety mode compares two input signals to verify they match within a configured tolerance. For instance, if you connect two pressure sensors to inputs 0 and 1, the module monitors their difference. Should a significant discrepancy occur, the module generates a fault, signaling a potential sensor or wiring issue.

Q3: How do I configure the 1734-IE4S module for a 4-20 mA current input?
A3: You must access the module's configuration software and select the desired channel. Then, choose "Current" as the input type. Finally, select the "4-20 mA" range from the dropdown menu. The module will then apply the appropriate scaling and fault thresholds automatically.

Q4: What is the maximum cable length for sensors connected to the 1734-IE4S?
A4: The maximum recommended cable length depends primarily on the signal type and ambient electrical noise. For current signals, you can typically run cables up to 100 meters. For voltage signals, however, we recommend shorter runs to minimize noise pickup. Additionally, use shielded twisted-pair cables for best performance in noisy environments.

Q5: Can I use the sensor power output of the 1734-IE4S to power my loop-powered transmitter?
A5: Yes, the 1734-IE4S provides sensor power outputs that are individually current-limited. These outputs are designed specifically for powering loop-powered transmitters. Furthermore, the built-in current monitoring helps you identify shorts or overloads quickly. However, always verify the power requirements of your transmitter against the module's output capability to avoid overloading.