Operating Instructions

Chapter 2—Hardware Features
PXC Compact on P1
0
82
| 118
Siemens Industry, Inc.
Owner's Manual
553-104
Building Technologies
2018-10-01
Processor, Battery, and Memory
Processor and Clock Speed Freescale MPC852T, 100 MHz
Memory 24 MB (16 MB SDRAM, 8 MB Flash ROM)
Serial EEPROM 4 KB
Battery backup of Synchronous Dynamic
(SD) RAM (field replaceable)
AA (LR6) 1.5 Volt Alkaline (non-rechargeable)
180 days (accumulated)
Typical Accumulated Battery Life of Compact UEC:
16MB SDRAM Std (alkaline): 180 days
Rooftop (Extended Temperature) Models: 330 days (accumulated)
AA (LR6) 3.6 Volt Lithium (non-rechargeable)
Battery backup of Real Time Clock
10 years (32°F to 122°F (0°C to 50°C))
Coin cell (BR2032) 3 Volt lithium
These are typical accumulated times while power is off.
Rooftop (Extended Temperature) Models 18 months
BACnet MS/TP Field Level Network (FLN) 9600 bps to 115.2 Kbps
Factory-
set HMI Communication Speed
9600 bps
Electrical
Power Requirements 24 Vac ±20% input @ 50/60 Hz
Power Consumption (Maximum) PXC-16: 18 VA @ 24 Vac
PXC-24: 20 VA @ 24 Vac
PXC-36: 35 VA 24 Vac
AC Power and Digital Outputs NEC Class 1 Power Limited
Communication and all other I/O NEC Class 2
Digital Input
Contact Closure Sensing
Dry Contact/Potential Free inputs only
Does not support counter inputs
Digital Output Class 1 Relay
Analog Output 0 to 10 Vdc
Universal Input (UI) and Universal
Input/Output (U)
Analog Input
Voltage (0-10 Vdc)
Current (4-20 mA)
1K Ni RTD @ 32°F
1K Pt RTD (375 or 385 alpha) @ 32°F
10K NTC Type 2 or Type 3 Thermistor @ 77°F
100K NTC Type 2 Thermistor @ 77°F
Digital Input
Pulse Accumulator
Contact Closure Sensing
Dry Contact/Potential Free inputs only
Supports counter inputs up to 20 Hz
Analog Output (Universal Input/Output (U) points only)
Voltage (0-10 Vdc)