Frequently Asked Questions (FAQ) — ABB PM856
Q1: What power supply does the PM856 require?
A1: It operates on 24 V DC within a 19.2 to 30 V range and supports redundant power supplies for increased reliability.
Q2: What processor is used in the PM856?
A2: It uses a Motorola MC68360 16-bit RISC CPU running at 25 MHz.
Q3: How much memory does the PM856 have?
A3: The PM856 comes with 512 KB RAM and 1 MB of flash memory.
Q4: Which communication protocols are supported?
A4: It supports RS-232, RS-485, Profibus DP, Modbus RTU, and optional Ethernet interfaces.
Q5: How many I/O modules can the PM856 handle?
A5: It can support up to 24 I/O modules, divided into 12 electrical and 12 optical modules.
Q6: What are the operating temperature limits?
A6: The PM856 is designed to operate from -40°C up to +70°C.
Q7: What are the physical dimensions and weight of the module?
A7: The dimensions are 225 mm wide, 108 mm deep, and 135 mm high, weighing approximately 1.1 kg.
Q8: Can the PM856 be hot-swapped?
A8: No, it must be powered down before removal or installation to ensure system integrity.
Q9: What industrial environments is the PM856 suited for?
A9: It is ideal for heavy industry such as power plants, water treatment facilities, chemical processing, and manufacturing.
Q10: Does the PM856 support redundant power supplies?
A10: Yes, it supports redundant 24 V DC power supplies to enhance system uptime.
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