Rockwell Automation Allen-Bradley 1769-L24ER-QBFC1B

Rockwell Automation Publication 1769-UM021I-EN-P - May 2018 311
Appendix B
Replacement Considerations
The CompactLogix™ L1 Series B controller is a direct replacement for the
Series A controller. The Series B controller has an improved power supply
circuit to the isolated power supply so that a second power supply is no longer
needed.
The Series A controller requires two power supplies:
• One to supply the controller power (VDC)
• One to supply the field power (FP)
Product Comparison
Power Considerations
CompactLogix L1 Series A and Series B
Embedded DC Input Considerations
CompactLogix L1 Series A and Series B
Firmware Compatibility
CompactLogix L1 Series A and Series B
Characteristics CompactLogix L1 Series B CompactLogix L1 Series A
Power dissipation 11.5 W 12 W
Recommended external short circuit
protection, field power
User-provided 4...5 A @
3.15...5.5 It fuse
User-provided 4...6 A @
52.5...68.25 It fuse
Embedded power supply 24V DC input, isolated 24V DC input, non-isolated
Line requirement (V DC), min 30VA 50VA
Current draw @ 24V DC, field power,
max
3 A @ 24V DC –
Characteristics CompactLogix L1 Series B CompactLogix L1 Series A
Off-state current, max 1 mA 1.5 mA
Input impedance, max 5.4 kΩ 4.7 kΩ
Firmware Revision
20.011 20.012 20.013 20.014 20.011 23.012 24.011
Series A yes yes yes yes yes yes yes
Series Bnononoyesnonoyes