Technical Data · Publication 1734-TD001 · Rockwell Automation
Allen-Bradley POINT I/O — Technical Data (Bulletin 1734)
Technical-data reference for the Allen-Bradley POINT I/O modular I/O family (Bulletin 1734). Consolidates communication-adapter specifications, POINTBus backplane power limits, module ratings, terminal-base choices, and environmental/certification data for all 1734-* digital, analog, safety, and specialty modules.
Specifications
POINTBus Backplane & System Power
| Backplane | POINTBus — 5V DC, generated by the communication adapter from 24V DC field input |
|---|---|
| Adapter POINTBus output (1734-AENT / AENTK) | 5V DC @ 1.0 A max |
| Adapter POINTBus output (1734-AENTR / AENTRK) | 5V DC @ 0.8 A max |
| Adapter input voltage | 10…28.8V DC (24V DC nominal, field power) |
| Field-power pass-through | 10…28.8V DC @ 9 A max through the terminal base rail |
| Module input current (typ) | Up to 1000 mA per adapter for module power; check each module datasheet |
| Isolation voltage | 50V continuous (reinforced); type-tested at 500V AC for 60 s between all circuits |
| Expansion power supplies | 1734-EP24DC (24V DC in) or 1734-EPAC (120/240V AC in) — extend POINTBus when current budget is exceeded |
| Field-potential distributor | 1734-FPD — creates a new field-power segment without breaking POINTBus |
Module Ratings Summary
| DC digital input | 24V DC nom (10…28.8V DC); 2 / 4 / 8 points; sinking (IB) or sourcing (IV) |
|---|---|
| AC digital input | 120V AC (85…132V) on IA; 220V AC (159…264V) on IM; 2 / 4 points |
| DC digital output | 24V DC nom (10…28.8V DC); 1 A per channel sourcing (OB) or sinking (OV); OB2EP rated 2 A |
| AC digital output | 120 / 220V AC nom (74…264V AC); 0.75 A per channel (OA) |
| Relay output | 5…240V RMS @ 2 A (load-dependent); Type A (OW) or Type 2 Form C (OX) |
| Analog input (current) | 2-channel, 16-bit over 0…21 mA range; 0…20 mA or 4…20 mA mode (1734-IE2C, IE2CK) |
| Analog input (voltage) | 2-channel, 15-bit + sign over -10…+10V; 0…10V or ±10V mode (1734-IE2V) |
| Analog output (current) | 2-channel, 13-bit over 0…21 mA (1734-OE2C, OE2CK) |
| Analog output (voltage) | 2-channel, 14-bit over -10…+10V (1734-OE2V, OE2VK) |
| Input filter times | Selectable 0…65 ms (1 ms default) on digital inputs |
| Analog notch filter | 50 / 60 / 250 / 500 Hz selectable; digital time-constant filter also available |
Communication Adapter Specifications
| 1734-AENT / AENTK (EtherNet/IP) | 17 modules max; 10/100 Mbps single-port; POINTBus 5V @ 1.0 A |
|---|---|
| 1734-AENTR / AENTRK (EtherNet/IP dual-port) | 17 modules max; dual-port DLR ring, 10/100 Mbps; POINTBus 5V @ 0.8 A |
| 1734-ACNR / ACNRK (ControlNet redundant) | Up to 250 kbit/s at 250 m, 128 kbit/s at 500 m; 24V DC @ 400 mA |
| 1734-ADN / ADNK / ADNX (DeviceNet) | 13 modules on POINTBus; 125 / 250 / 500 kbit/s; DeviceLogix + subnet (ADNX) |
| 1734-PDN / PDNK (DeviceNet block) | POINT I/O on DeviceNet; integral field power |
| 1734-APB (PROFIBUS DP) | 9-pin D-sub; all rates up to 12 Mbps via APBDPV1; POINTBus 5V output |
| N. American hazardous-location temp code | T4A / T4 |
| ATEX / UKEX temp code | T4; II 3 G Ex ec IIC T4 Gc (Zone 2) |
Environmental (All POINT I/O Modules)
| Temperature, operating | -20…+55 °C (-4…+131 °F), IEC 60068-2-1 / -2-2 / -2-14 |
|---|---|
| Temperature, surrounding air max | 55 °C (131 °F) |
| Temperature, nonoperating | -40…+85 °C (-40…+185 °F) |
| Relative humidity | 5…95% noncondensing (IEC 60068-2-30, Damp Heat) |
| Vibration | 5 g @ 10…500 Hz (IEC 60068-2-6) |
| Shock, operating | 30 g (IEC 60068-2-27, Test Ea) |
| Shock, nonoperating | 50 g |
| Emissions | IEC 61000-6-4 (industrial); CISPR 11 Group 1 Class A |
| ESD immunity | 6 kV contact / 8 kV air (IEC 61000-4-2) |
| Radiated RF immunity | 10V/m, 80…6000 MHz, 80% AM (IEC 61000-4-3) |
| Surge transient immunity | ±1 kV line-line / ±2 kV line-earth on power ports (IEC 61000-4-5) |
| Enclosure | None (open-style) — install in a suitable enclosure |
| Mounting | 35 mm DIN rail; horizontal or vertical without derating |
Physical & Wiring
| Module width | ~12 mm per I/O module (1734-TB / TBS base) |
|---|---|
| Expansion-supply width | ~25.4 mm (1734-EP24DC / FPD) |
| Node-length formula (with AENT-class adapter) | L (mm) = 54.9 + (#modules × 12.0) + (#EP24DC or FPD × 25.4) |
| Wire size | 22…14 AWG solid or stranded copper, 75 °C rated (screw-clamp or spring-clamp RTB) |
| DIN rail air gap | 25.4 mm (1.0 in) clearance all around for cooling |
| DIN rail fastening | Secure rail to mounting surface every ~200 mm (7.8 in) |
Catalog Number Format
How to read an Allen-Bradley 1734 catalog number. Each position encodes a specific configuration attribute.
Position
Meaning
Example
1734
Bulletin prefix for POINT I/O family
1734-IB8 → Bulletin 1734
-I / -O / -IE / -OE / -OW / -OX / -IR / -IT / -IJ / -IK
Module function (I=digital input, O=digital output, IE=analog input, OE=analog output, OW/OX=relay output, IR=RTD input, IT=thermocouple input, IJ/IK=counter/encoder)
-I = digital input; -OE = analog output; -IR = RTD input
B / V / A / M
Signal type — B=24V DC sinking, V=24V DC sourcing, A=120V AC, M=220/240V AC
IB = DC sinking input; IV = DC sourcing input; IA = 120V AC input
2 / 4 / 8
Channel / point count per module
IB8 = 8 points; OW4 = 4 relay points
E / S / D / P / C / V / K / XT
Suffix variant — E=Electronically protected, S=Safety (POINT Guard) or Spring-clamp (bases), D=Diagnostic, P=High-current protected, C=Current analog, V=Voltage analog, K=Conformal coat, XT=Extended temperature
OB8E = protected output; IB8S = Safety input; OB2EP = 2 A protected output; IE2C = 2-ch current analog
Adapter codes
Network adapters replace module codes — AENT/AENTR (EtherNet/IP), ACNR (ControlNet), ADN/ADNX (DeviceNet), APB (PROFIBUS DP)
1734-AENT = EtherNet/IP single-port adapter
Communication Protocols
Supported industrial networks and field buses for the products covered by this publication.
EtherNet/IP 1734-AENT / AENTK (single-port) or 1734-AENTR / AENTRK (dual-port, DLR ring-capable). 10/100 Mbps. Up to 17 modules per adapter.
ControlNet 1734-ACNR / ACNRK. Redundant coax media; deterministic scheduled + unscheduled traffic. Up to 17 modules.
DeviceNet 1734-ADN / ADNK / ADNX. 125/250/500 kbit/s. ADNX includes DeviceNet subnet gateway and DeviceLogix for local control. Up to 13 modules.
DeviceNet (block) 1734-PDN / PDNK — integrated DeviceNet interface with field power; limited to standard POINT I/O.
PROFIBUS DP / DPV1 1734-APB (DP) and 1734-APBDPV1 (DPV1). Up to 12 Mbps on APBDPV1.
NetLinx Open Architecture Transparent cross-network messaging between EtherNet/IP, ControlNet, and DeviceNet via Logix gateways.
Certifications & Compliance
c-UL-us — UL Recognized Industrial Control Equipment (UL File E65584)
c-UL-us — Class I Division 2 Groups A, B, C, D Hazardous Locations (UL File E194810)
UKCA + CE — EN 61326-1, EN 61000-6-2, EN 61000-6-4, EN 61131-2 (Clause 8, Zone A & B)
ATEX Zone 2 — II 3 G Ex ec IIC T4 Gc (DEMKO 04 ATEX 0330347X)
UKEX — UL 22 UKEX 2478X; T4 temperature code
IECEx — IEC 60079-0 / -7; II 3 G Ex ec IIC T4 Gc (IECEx UL 20.0072X)
RCM — AS/NZS CISPR 11 Industrial Emissions
KC — Korean Registration of Broadcasting and Communications Equipment
CCC — CNCA-C23-01 (including Explosion-Proof Implementation Rule)
RoHS — EN IEC 63000
ODVA / ControlNet International conformance (per adapter)
Document Contents
Full PDF covers the following topics in detail:
- POINT I/O system architecture overview (adapter → POINTBus → terminal base + RTB + module)
- POINTBus power budget — adapter 5V DC output, module draw, expansion-supply planning
- Communication adapter specifications — EtherNet/IP, ControlNet, DeviceNet, PROFIBUS DP
- Digital I/O module ratings — AC/DC, sinking/sourcing, protected, diagnostic, relay
- Analog I/O module ratings — current, voltage, RTD, thermocouple, HART-capable
- POINT Guard Safety I/O module ratings (SIL 3 / PL e)
- Terminal base / RTB selection — screw-clamp, spring-clamp, one-piece, CJC variants
- Environmental specifications — temperature, humidity, vibration, shock, EMC, surge
- Hazardous-location certifications — Class I Div 2, ATEX / UKEX / IECEx Zone 2, Marine
- Mounting dimensions — DIN rail, node-length formula, air-gap and orientation requirements
- Wiring and conductor-routing guidelines (cross-reference to publication 1770-4.1)
In-Stock Products Covered by This Document
Every product below is in stock at our Charlotte, NC warehouse and covered by this publication. Ships same-day (orders before 4 PM ET) with 2.5-year warranty included.
Frequently Asked Questions
What voltage does POINTBus run at, and where does it come from?
POINTBus is 5V DC. The communication adapter (1734-AENT, AENTR, ACNR, ADN, APB, etc.) has a built-in DC/DC converter that takes the 24V DC field supply and generates the 5V DC POINTBus rail. Every I/O module on the backplane draws from that 5V rail. The AENT / AENTK adapter supplies up to 1.0 A on the POINTBus output; the AENTR / AENTRK dual-port adapter supplies up to 0.8 A.
How do I know if I need a 1734-EP24DC expansion power supply?
Sum the POINTBus (5V) current draw of every module you plan to install behind a single adapter and compare it against the adapter's POINTBus output (typically 0.8 – 1.0 A). If you exceed the adapter's budget — or you've exceeded the per-node module count (13 – 17 depending on adapter) — add a 1734-EP24DC. The expansion supply takes 24V DC field power and injects a fresh 5V POINTBus rail, letting you add more modules downstream.
What's the difference between a 1734-FPD and a 1734-EP24DC?
The 1734-EP24DC is an expansion power supply — it generates a new 5V POINTBus rail and lets you add more modules beyond the adapter's current budget. The 1734-FPD (Field Potential Distributor) does NOT generate POINTBus power; it breaks the field-power rail so you can start a new field-power group (for example, to isolate a group of modules at a different voltage or to provide a fuse boundary) while leaving POINTBus continuous.
What's the operating temperature range for POINT I/O?
Standard POINT I/O is rated -20…+55 °C (-4…+131 °F) operating, -40…+85 °C nonoperating, 5…95% RH noncondensing. Modules are horizontally or vertically mountable without derating. For hazardous locations, POINT I/O carries Class I Div 2, ATEX / UKEX / IECEx Zone 2 (Ex ec IIC T4 Gc) certification.
Can POINT I/O modules be removed under power?
Yes — every POINT I/O module supports Removal and Insertion Under Power (RIUP). Because field wiring lands on the terminal base (not the module), you can pull a module without disturbing wiring, other modules, or the POINTBus rail. When the replacement snaps in, the adapter auto-downloads its configuration via Automatic Device Replacement (ADR). The one caveat is hazardous-location installations, where you must verify the area is non-hazardous before removing a module under power.
What terminal-base options are there for POINT I/O?
The most common bases are 1734-TB (screw-clamp) and 1734-TBS (spring-clamp) standard bases, 1734-TB3 / TB3S (3-wire sensor bases for inputs with +V and common rails on every terminal), 1734-TOP / TOPS (one-piece bases that combine base + RTB), and 1734-TBCJC (cold-junction compensation base for the 1734-IT2I thermocouple module). All support 22…14 AWG copper wire rated at 75 °C.
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