Allen-Bradley 1747-BA SLC 500 Lithium Battery Assembly
The Allen-Bradley 1747-BA serves as the primary 1747-BA Lithium Battery Assembly utilized to execute memory retention and RAM backup across SLC 500 platforms. It supplies continuous auxiliary power to volatile memory circuits when system power is removed, preventing loss of PLC user programs, register data, and system configuration parameters.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1747-BA |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.56 lbs (0.26 kg) |
| Dimensions | Compact processor slot lithium cell module |
| Operating Temp | 0 to +60 deg C |
| Power Consumption | Non-rechargeable battery cell (375 mA backplane current reference) |
| Voltage | 3 VDC nominal |
| Battery Chemistry | Lithium Metal (0.23 grams lithium content) |
| Storage Environment | 20 to 25 deg C (40% to 60% RH, non-condensing) |
| Backup Service Life | ~5 years (SLC 5/01 1747-L511), ~2 years (SLC 5/02, 5/03, 5/04, 5/05) |
Backplane Bus Velocity & Deterministic Network Execution
The 1747-BA maintains steady backup voltage to the static RAM array, preserving user program execution structures and system node configuration parameters required for high-speed backplane bus communication velocity upon system restart. By preventing RAM corruption during power interruptions, the battery ensures that processor nodes rejoin deterministic networks without requiring program reload routines or network reconfiguration cycles. An integrated low-battery detection circuit monitors cell voltage and triggers the CPU front-panel battery LED when voltage drops below critical thresholds.
Frequently Asked Questions
Q: Can the 1747-BA battery be replaced while the SLC 500 processor is powered on?
A: Yes, replacing the 1747-BA while primary power is applied to the SLC 500 chassis ensures that processor volatile memory remains continuous and active, preventing program data loss during the swap procedure.
Q: How long can the RAM retain memory if the battery is removed while the CPU is unpowered?
A: Onboard capacitor backup circuits provide short-term memory retention for approximately 30 minutes to 30 hours (depending on CPU model and ambient temperature), allowing quick battery replacement without program loss.
Field Installation Guidelines
- Handling & Storage Limits: Store spare batteries in a cool, dry area at 20 to 25 deg C away from direct metallic surfaces or conductive antistatic materials. Do not crush, puncture, disassemble, or expose cells to temperatures above 60 deg C.
- Connector Insertion: Locate the battery compartment on the front or side of the SLC 500 CPU module. Firmly seat the polarized lead connector into the CPU battery header pin receptacle to establish secure electrical polarity.
- Disposal & Shipping Compliance: Handle spent lithium cells as UN Class 9 Dangerous Goods in compliance with local environmental regulations. Never short-circuit terminals or incinerate depleted battery cells.
Allen-Bradley 1747-BA SLC 500 Lithium Battery Assembly
Allen-Bradley 1747-BA SLC 500 Lithium Battery Assembly
The Allen-Bradley 1747-BA serves as the primary 1747-BA Lithium Battery Assembly utilized to execute memory retention and RAM backup across SLC 500 platforms. It supplies continuous auxiliary power to volatile memory circuits when system power is removed, preventing loss of PLC user programs, register data, and system configuration parameters.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1747-BA |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.56 lbs (0.26 kg) |
| Dimensions | Compact processor slot lithium cell module |
| Operating Temp | 0 to +60 deg C |
| Power Consumption | Non-rechargeable battery cell (375 mA backplane current reference) |
| Voltage | 3 VDC nominal |
| Battery Chemistry | Lithium Metal (0.23 grams lithium content) |
| Storage Environment | 20 to 25 deg C (40% to 60% RH, non-condensing) |
| Backup Service Life | ~5 years (SLC 5/01 1747-L511), ~2 years (SLC 5/02, 5/03, 5/04, 5/05) |
Backplane Bus Velocity & Deterministic Network Execution
The 1747-BA maintains steady backup voltage to the static RAM array, preserving user program execution structures and system node configuration parameters required for high-speed backplane bus communication velocity upon system restart. By preventing RAM corruption during power interruptions, the battery ensures that processor nodes rejoin deterministic networks without requiring program reload routines or network reconfiguration cycles. An integrated low-battery detection circuit monitors cell voltage and triggers the CPU front-panel battery LED when voltage drops below critical thresholds.
Frequently Asked Questions
Q: Can the 1747-BA battery be replaced while the SLC 500 processor is powered on?
A: Yes, replacing the 1747-BA while primary power is applied to the SLC 500 chassis ensures that processor volatile memory remains continuous and active, preventing program data loss during the swap procedure.
Q: How long can the RAM retain memory if the battery is removed while the CPU is unpowered?
A: Onboard capacitor backup circuits provide short-term memory retention for approximately 30 minutes to 30 hours (depending on CPU model and ambient temperature), allowing quick battery replacement without program loss.
Field Installation Guidelines
- Handling & Storage Limits: Store spare batteries in a cool, dry area at 20 to 25 deg C away from direct metallic surfaces or conductive antistatic materials. Do not crush, puncture, disassemble, or expose cells to temperatures above 60 deg C.
- Connector Insertion: Locate the battery compartment on the front or side of the SLC 500 CPU module. Firmly seat the polarized lead connector into the CPU battery header pin receptacle to establish secure electrical polarity.
- Disposal & Shipping Compliance: Handle spent lithium cells as UN Class 9 Dangerous Goods in compliance with local environmental regulations. Never short-circuit terminals or incinerate depleted battery cells.
