The Emerson DeltaV S-series traditional I/O module is a modular input/output subsystem designed specifically for DeltaV distributed control systems (DCS). Its core positioning is to enhance the flexibility, reliability, and installation and operation efficiency of industrial process control. It is suitable for industrial scenarios such as petrochemicals, electricity, and energy that require high environmental adaptability and system stability. It can achieve precise acquisition and output of analog and discrete signals.

Core Features and Advantages

Modular and flexible architecture

Scalable design: A single controller can support up to 8 I/O carriers, with a total of 64 I/O slots. It supports mixing various I/O modules such as analog (AI/AO) and discrete (DI/DO) to meet the signal acquisition and control needs of different scenarios.

On demand configuration: Supports the “on-demand procurement” mode, allowing for the selection of I/O cards, 8-slot carriers, power supplies/controllers, and other components based on the system size. These components can be flexibly added as the system expands, avoiding resource waste.

Efficient installation and maintenance

Tool free installation: The carrier is fixed to the T-shaped DIN rail through a buckle, and the I/O module is directly inserted into the slot without the need for tools; All wiring is completed through carriers and terminal blocks, and there is no need to disconnect on-site wiring when replacing modules, reducing maintenance downtime.

Error proof design: Each I/O module and terminal block is equipped with a dedicated “key positioning” mechanism (two rotatable positioning columns, 6 position combinations), allowing only matching modules to be inserted into the corresponding terminal block to avoid the risk of incorrect installation.

Integrated power supply: The I/O carrier is equipped with a 24V DC bus based on-site power distribution, which is divided into primary/secondary power supplies for odd/even slots. Each slot is independently protected by a fuse, reducing the design of external power supply circuits and ensuring that single card failures do not affect other modules.

Online Expansion and High Availability

Online expansion: Supports adding I/O carriers with power on (directly connected to the right side of existing carriers or installed on other DIN rails through extension cables). The controller automatically detects new carriers and modules and enters them into the configuration database without interrupting existing I/O communication.

1: 1. Redundant backup: 4 types of critical I/O cards (such as 8-channel AI/AO, 32 channel DI/DO) support redundant configuration, and can be automatically recognized as redundant pairs by the system when installed in pairs on redundant terminal blocks. In the event of a fault, the switching can be completed within 2 I/O bus scanning cycles (signal overlap<5ms during analog switching, and digital “first on, then off” to ensure uninterrupted power supply to the device), without the need for additional configuration.

Adaptability to harsh environments

Wide temperature operation: All I/O modules operate within a temperature range of -40~70 ℃ (-40~158 ℉) and can be installed in on-site cabinets to reduce the control room footprint and shorten the length of multi-core cable wiring, thereby lowering costs.

Anti interference and anti-corrosion: Complies with ISA-S71.04-1985 G3 level anti-corrosion standard (using normal coating), anti impact (10g half sine wave, 11ms), anti vibration (1mm peak to peak value at 5-13.2Hz, 0.7g at 13.2-150Hz), suitable for complex electromagnetic and environmental interference in industrial sites.

Core product composition and I/O module classification

1. Subsystem composition

The traditional I/O subsystem of DeltaV S-series mainly includes the following components:

I/O carrier: DIN rail installation, carrying all I/O components, providing bus power supply and communication interfaces, divided into 8 slot horizontal carriers and other types.

Power supply: Large capacity AC to 24V DC power supply, providing power for on-site equipment and I/O modules.

I/O module: including analog input/output, discrete input/output and other types, all of which adopt a unified appearance design and are used with dedicated terminal blocks.

Auxiliary accessories: Cable extender (flexible adjustment of carrier installation position), terminal block (standard/fused/redundant type), Mass connection module (compatible with third-party wiring schemes).

2. I/O module types and key parameters

The modules are divided into two categories: analog (AI/AO) and discrete (DI/DO), and support simplex (single-mode) or redundant (redundant) installation. The following are the core module specifications:

(1) Analog input (AI) module

Module type, channel number, signal type, key parameters

AI 4-20mA HART 8 4-20mA (2/4 wire system) resolution 16 bits, accuracy of 0.1% range at 25 ℃, channel optical isolation 1500V DC, supporting HART transparent transmission (scan time 600-800ms/channel)

AI Plus 4-20mA HART 16 4-20mA (2/4-wire system) resolution 16 bits, accuracy 0.2% range, channel optical isolation 1000V DC, supports Mass terminal block and fault detection

RTD module 8 Pt100/Pt200/Ni120 2/3/4 wire system, excitation current 100 μ A, Pt100 measurement range -200~850 ℃, accuracy ± 0.5 ℃ (25 ℃)

Thermocouple/mV module 8 B/E/J/K/N/R/S/T type thermocouple, mV signal cold end compensation ± 1 ℃, mV range -100~100mV, accuracy ± 0.1mV (25 ℃)

Isolation type AI module 4 thermocouples/mV/V/RTD channel optical isolation 1500V DC, supports wide range voltage signals (0-5V/0-10V, etc.), and improves accuracy (such as E-type thermocouples ± 0.5 ℃)

(2) Analog Output (AO) Module

Module type, channel number, signal type, key parameters

AO 4-20mA HART 8 4-20mA resolution 14 bits, -40~60 ℃ accuracy 0.25% range, channel optical isolation 1500V DC, supports open circuit detection (<0.7mA)

AO Plus 4-20mA HART 16 4-20mA resolution 14 bits, accuracy 0.25% range, channel optical isolation 1000V DC, supports Mass terminal block, maximum on-site power supply 400mA@24V  DC

(3) Discrete Input (DI) module

Module type, channel number, signal type, key parameters

DI 24V DC dry contact 8 dry contact (compatible with NAMUR sensor) with conductivity detection>2.2mA, shutdown<1mA, input impedance 5k Ω, channel optical isolation 1500V DC

DI Plus 24V DC dry contact 32 24V DC dry contact conductivity detection>2mA, shutdown<0.25mA, supports terminal fault detection (requires Mass terminal block), on-site power supply 150mA@24V  DC

Pulse Counting Input (PCI) 4 24V DC frequency range 0.1Hz~50kHz, minimum pulse width 10 μ s, 32-bit unsigned counter, channel optically isolated 1500V DC

Sequence of Events (SOE) input 16 24V DC dry contact channel scan rate 0.25ms/16 channels, timestamp accuracy ± 0.25ms (single card)/± 1ms (single controller), supports event logging

DI 120V AC isolation type 8 120V AC conduction detection 84~130V AC, turn off 0~34V AC, input impedance 60k Ω, channel to channel optical isolation 250V AC

(4) Discrete Output (DO) module

Module type, channel number, signal type, key parameters

DO 24V DC high side 8 24V DC maximum 1A continuous output per channel (surge 4A<100ms), turn off leakage<1.2mA, channel optical isolation 1500V DC

DO Plus 24V DC high side 32 24V DC output of 100mA per channel, cut-off leakage<0.1mA, supports terminal fault detection, on-site power supply 3.2A@24V  DC

DO 120/230V AC isolation type 8 120/230V AC maximum 1A continuous output per channel (surge 5A<100ms), turn off leakage 2mA (120V AC)/4mA (230V AC), channel to channel optical isolation 250V AC

Terminal block and system compatibility

1. Terminal block type and adaptation

Terminal blocks are divided into standard terminal blocks, fuse terminal blocks, redundant terminal blocks, and Mass terminal blocks. Different I/O modules require dedicated terminal blocks, and the core adaptation relationship is as follows:

Example features of terminal block type adaptation module

8-channel standard terminal block, 8-channel AI/AO, 8-channel DI/DO basic wiring, supporting single-mode installation

8-channel fuse terminal block. All 8-channel modules are equipped with 2A fuses to protect the on-site circuit

Redundant 8-channel terminal block with 8-channel redundant AI/AO and DI/DO supports parallel installation of 2 modules to achieve redundant backup

Mass terminal block (16/24/40/48 pins) Plus series modules, some standard modules are compatible with S-series Mass connection solutions or third-party devices (such as Pepperl+Fuchs HiC safety barriers), optimizing on-site wiring

2. System compatibility requirements

Controller: SQ or SX series controllers are required, and V11.3.1 and above versions of the DeltaV system support S-series and M-series controllers running on the same network.

Software version: The Plus series modules (16 channel AI/AO, 32 channel DI/DO) require DeltaV v13.3 or higher.

Installation restrictions: only supports horizontal carriers, not compatible with vertical carriers; Vertical I/O applications require the use of CHARMS electronic grouping I/O.

Certification and Security Standards

International certification:

Electrical safety: CE (EN 61326-1), FM (3600/3611), CSA (C22.2 No.213/1010-1).

Explosion proof certification: ATEX（II 3G Ex ec IIC T4 Gc）、IECEx（II 3G Ex ec IIC T4 Gc）、FM/CSA Class I, Division 2（Groups A-D, T4）。

Classification certification: IACS E10, ABS design evaluation certificate, DNV marine certificate.

Safety design:

Isolation protection: All module channels are optically isolated from the system (1000~1500V DC), and some discrete module channels are additionally isolated from each other.

Fault alarm: Hardware faults (such as module failure, communication interruption, on-site wiring failure) automatically trigger system alarms, with logs recorded in the Event Chronicle, and support for real-time viewing of module status on the diagnostic interface.

Order

1. Core module ordering model (example)

Module Description Model Example

8-channel AI 4-20mA HART (with AI 8-channel terminal block) SE4003S2B1

16 channel AO Plus 4-20mA HART (with 48 pin Mass terminal block) SE4005S2B5

32 channel DI Plus 24V DC (with redundant 40 pin Mass terminal block) SE4081S2T2B7

8-channel DO 120/230V AC isolated type (with fuse terminal block) SE4002S2T1B2