531X301DCCAPG1 | In Stock GE 301 Series Mainframe

Description

Product Introduction

Profibus DP is the fieldbus of choice for many heavy industries—steel mills, mining, and material handling. The GE 531X301DCCAPG1 is the 301-series expansion chassis with an integrated Profibus DP interface, bringing the DP connector right to the rear panel of the expansion rack. No more running Profibus cables through the cabinet to a separate gateway or a faraway master chassis. It’s Profibus-ready, right where you need it.

The model number tells the story: “301” is the expansion series, “DC” indicates DC input power, “CA” is the standard Class A filter (DC version), “P” adds the Profibus DP integration, and “G1” is the revision with the 80mm fans and the 50W DC power module. The Profibus interface is a standard 9-pin D-sub connector on the rear panel, pre-wired to the backplane’s serial header (slot 2). The connector includes a built-in termination switch—flip it to “ON” if this chassis is the end of your Profibus segment; flip it to “OFF” if it’s in the middle. The chassis includes the standard 50W DC power module (5V @ 10A, 24V @ 3A), the expansion interface (fiber or cable), and the 80mm fans (45 CFM). The depth is 14.5″ (same as the standard AM1). One caveat: the Profibus interface is a physical layer only—the protocol stack still runs on your logic board or communication board.

Key Technical Specifications

Compatible Replacement Models

✅ Drop-in Replacement:

• 531X301DCCAPG1 directly replaces 531X301DCCAPG0. The PG1 has the same Profibus connector, same termination switch, same pre-wiring. The only difference is the fans—the PG1 has improved fan bearings. Swap your boards and power module over.
• 531X301DCCAM1 (standard expansion chassis): The PG1 is the Profibus-ready version of the standard AM1. If you need Profibus DP connectivity, the PG1 is a direct replacement. The backplane and slot spacing are identical. Move your boards over—the Profibus connector is pre-wired.

⚠️ Software Compatible (Requires Recompile):

• None. The Profibus connector is a passive wiring interface—it just connects the backplane serial pins to the D-sub connector. No firmware, no configuration. The Profibus protocol is handled by your logic board or communication board. No recompile needed. However, you may need to configure the logic board for Profibus DP (e.g., set the node address via software).

❌ Hardware Incompatible:

• 531X301DCCAPG1 with a master chassis that doesn’t support expansion: The master must have the expansion interface connector.
• 531X301DCCAPG1 with fiber-optic cable longer than 100 meters: The fiber transceivers are rated for 100 meters max.
• 531X301DCCAPG1 with a 212-series AC power supply: The PG1 is DC input only.
• 531X301DCCAPG1 with Profibus cable that doesn’t meet the spec: Use standard Profibus cable (purple, 22 AWG, 120Ω characteristic impedance). The D-sub connector is standard; any Profibus cable with a DB-9 connector will work.

Frequently Asked Questions (FAQ)

Q: What’s the purpose of the Profibus connector on an expansion chassis?

A: Expansion chassis are often in the field, close to the machinery. The Profibus connector lets you connect your Profibus DP network directly to the expansion chassis—no need to run the cable all the way to the master chassis. The connector is pre-wired to the backplane’s serial header, so the Profibus signal is available on the expansion chassis.

Q: Does the Profibus connector work with the expansion interface?

A: Yes. The Profibus connector is independent of the expansion interface. The Profibus signal goes through the backplane, and the expansion interface carries all signals between the master and expansion chassis. The Profibus connector is just a convenient connection point on the expansion chassis.

Q: How do I set the termination?

A: There’s a switch on the D-sub connector. Flip it to “ON” if this chassis is at the end of your Profibus segment. Flip it to “OFF” if it’s in the middle. Without proper termination, you’ll get reflected signals and communication errors. This is a common cause of Profibus issues. The switch is labeled on the connector.

Q: Which slot does the Profibus connector connect to?

A: The connector is pre-wired to the serial header on slot 2. If your logic board or Profibus communication board is in a different slot, you’ll need to check the wiring. The pre-wiring is fixed; you can’t change the assignment. GE assumed the Profibus board would be in slot 2.

Q: Can I use the PG1 with a 24V DC input?

A: Yes. The DC power module accepts 24V, 48V, or 125V DC, jumper-selectable. The input range for 24V is 19-30V. The module is field-replaceable (531X301PWR1). It’s not hot-swappable—power down the chassis before replacing it.

Q: Does the PG1 have a ground lug?

A: Yes. There’s an M6 ground stud on the rear panel. Connect it to your plant grounding bar. This is required for safety and EMI performance. The D-sub connector’s shield pin (pin 9) is also bonded to the chassis ground.

Q: Can I use the PG1 with a 120V AC input?

A: No. The PG1 is DC input only. If you have AC power, you need the AC-input expansion chassis (531X301DCCAxx). The PG1 is for battery-backed or DC bus systems.

Q: The PG1 has 80mm fans. Is that enough?

A: Yes. The expansion chassis has a lower thermal load than a master chassis. The 80mm fans (45 CFM) are sufficient for a fully loaded expansion chassis with the Profibus connector. The connector doesn’t add heat.

Q: What’s the maximum number of expansion chassis I can connect if I’m using the PG1?

A: The expansion interface supports up to 4 expansion chassis in a daisy chain. The PG1 is just another expansion chassis—it doesn’t limit the daisy chain. The Profibus connector is independent of the expansion chain.

Q: Does the PG1 come with the expansion cable?

A: No. The expansion cable (fiber-optic or backplane ribbon) is not included. The PG1 has the ports for the cable, but you need to supply the cable separately. We recommend using the GE-supplied cable. We stock the cables if you need them.

Q: Can I use the PG1 with a 12 Mbps Profibus network?

A: Yes—the connector and wiring support 12 Mbps. However, the actual baud rate is limited by your logic board or communication board. The physical layer is just wire; the board determines the maximum speed. The PG1’s connector and pre-wiring are rated for 12 Mbps.

Q: Is the Profibus connector isolated from the chassis?

A: No. The D-sub connector is directly connected to the backplane. There’s no isolation. The shield pin is connected to chassis ground. If you’re in a high-noise environment, use shielded cable with the shield connected to the chassis ground. The PG1 doesn’t provide optical isolation. If you need isolation, use an external Profibus isolator.

Honeywell 51309276-150
SCHNEIDER 490NRP25300
GE 78004653B