Allen-Bradley 1336-PB-SP2B Industrial Network Interface for 1336 Plus Systems

Allen-Bradley 1336-PB-SP2B: Industrial Data Link and Smart Factory Connectivity for 1336 Plus Drive Systems

The Allen-Bradley 1336-PB-SP2B (Part No. 74101-502-51) is a precision-engineered precharge PC board designed for the 1336 Plus AC drive series. In modern smart factory environments, the integrity of every hardware component within the drive control architecture directly determines the reliability of the entire industrial data chain — from field-level signal acquisition all the way to SCADA dashboards and MES platforms. The 1336-PB-SP2B plays a foundational role in ensuring that the 1336 Plus drive can safely energize its DC bus, protecting downstream power electronics and enabling uninterrupted communication across the automation network.

As industrial sites migrate toward fully connected architectures, the precharge circuit is no longer just a power management component — it is a critical node in the drive’s self-diagnostic and status-reporting loop. When integrated with Allen-Bradley PowerFlex 755 or legacy 1336 Impact drive families via a common DeviceNet or ControlNet backbone, the precharge board’s operational status is continuously monitored by the Logix 5000 PLC (such as the ControlLogix L73 or CompactLogix L33ER), which relays real-time fault codes and drive health data upstream to FactoryTalk View SE HMI stations and FactoryTalk Historian for trend analysis and predictive maintenance scheduling.

Network Communication Table

Connected Automation Data Flow

In a typical smart factory deployment, the 1336-PB-SP2B sits at the heart of the drive’s power-up sequence, enabling the 1336 Plus drive to safely ramp DC bus voltage before the main contactor closes. This precharge event is logged as a discrete status signal by the drive’s onboard firmware and transmitted via the 1336-MOD-A DeviceNet communication adapter to the plant’s DeviceNet scanner card — typically a 1756-DNB module seated in a ControlLogix chassis.

From the ControlLogix backplane, the drive status data flows through the 1756-EN2T EtherNet/IP bridge module into the plant Ethernet ring, where it is consumed by the FactoryTalk View SE SCADA server. Operators at the HMI workstation can monitor precharge completion status, DC bus voltage levels, and fault history in real time. Simultaneously, the FactoryTalk Historian archives every drive event for long-term trend analysis, enabling maintenance teams to detect early signs of precharge circuit degradation before a production-stopping fault occurs.

For multi-drive systems — such as those found in conveyor lines, pump stations, or compressor banks — the 1336-PB-SP2B’s reliable precharge function ensures that each 1336 Plus II drive unit comes online in a controlled, sequenced manner. This sequencing is coordinated by the CompactLogix L33ER PLC, which issues drive enable commands only after confirming precharge completion via the DeviceNet network. Remote I/O modules such as the 1734 POINT I/O series provide additional discrete feedback from motor starters and contactors, completing the field-level data loop back to the control system.

In facilities running Wonderware InTouch or Ignition SCADA platforms, the drive data is bridged via an OPC-DA or OPC-UA gateway, allowing cross-platform visibility of the 1336 Plus drive fleet without replacing existing SCADA infrastructure. Edge gateway devices — such as the Moxa MGate MB3170 or similar industrial protocol converters — can further extend connectivity to cloud-based MES or ERP systems, enabling enterprise-wide production transparency.

Solving Data Isolation in Industrial Sites

One of the most persistent challenges in legacy industrial environments is protocol fragmentation. Older 1336 Plus drive installations often rely on proprietary serial communication or hardwired discrete I/O, creating data silos that prevent real-time visibility into drive performance. The 1336-PB-SP2B, when paired with the appropriate communication adapter (such as the 1336-GM1 Remote I/O adapter or the 1336-BRF ControlNet adapter), bridges this gap by enabling the drive to participate in the plant’s digital communication backbone.

By restoring the precharge board to factory specification, maintenance engineers eliminate the root cause of nuisance precharge faults — faults that, in networked environments, generate cascading alarms across the SCADA system and trigger unnecessary production shutdowns. A properly functioning 1336-PB-SP2B ensures that the drive’s fault register remains clean, reducing false-positive alerts in FactoryTalk Alarms and Events and improving the signal-to-noise ratio of the plant’s alarm management system.

For sites undergoing digital transformation, replacing a failed precharge board with a tested, warranty-backed 1336-PB-SP2B is a cost-effective alternative to full drive replacement. It preserves the existing DeviceNet or ControlNet network topology, avoids re-engineering of PLC programs, and maintains compatibility with existing HMI screen configurations — dramatically reducing both downtime and capital expenditure.

All units supplied by ZYPLC are fully tested prior to shipment, backed by a 12-month warranty, and available for rapid global dispatch via DHL or FedEx. In-stock inventory ensures same-week shipping for urgent maintenance requirements.

Industrial Connectivity FAQ

Q1: Will the 1336-PB-SP2B cause any communication delays on the DeviceNet network during drive startup?
A: No. The precharge board operates at the power electronics level and completes its bus charging cycle before the drive’s communication adapter goes online. DeviceNet polling cycles are unaffected, and the drive appears on the network only after precharge is confirmed complete — ensuring zero communication disruption during startup sequencing.

Q2: Is the 1336-PB-SP2B compatible with both 1336 Plus and 1336 Plus II drive variants?
A: Yes. The 1336-PB-SP2B (74101-502-51) is designed for use across the 1336 Plus family. However, we recommend confirming the exact drive catalog number and firmware revision with our technical team prior to ordering, as certain hardware revisions may require specific board variants.

Q3: How does replacing this board affect the existing ControlNet or DeviceNet network configuration?
A: Replacing the precharge board is a hardware-level repair that does not alter the drive’s communication node address, I/O mapping, or network configuration. The drive will resume its existing network identity after the board swap, requiring no changes to PLC programs, HMI tag databases, or SCADA configurations.

Q4: What quality assurance process does ZYPLC apply before shipping the 1336-PB-SP2B?
A: Every 1336-PB-SP2B unit undergoes functional testing on a compatible 1336 Plus drive test bench prior to shipment. Units are verified for correct precharge timing, bus voltage ramp profile, and fault output signal integrity. All tested units are covered by a 12-month warranty from the date of shipment.

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