Data Sheet for Product

PXC Modular Series
Built-in Direct Digital Control Routines
4
Siemens Industry, Inc. 149-478
Smart Infrastructure 2020-05-20
Built-in Direct Digital Control
Routines
The PXC Modular provides stand-alone Direct Digital
Control (DDC) to deliver precise HVAC control and
comprehensive information about system operation. It
receives information from sensors in the building,
processes the information, and directly controls the
equipment. The following functions are available in
the PXC Modular:
• Adaptive Control, an auto-adjusting closed
loop control algorithm. Provides more
efficient, adaptive, robust, fast, and stable
control than the traditional PID control
algorithm. Superior in terms of response time,
holding steady state, and minimizing error,
oscillations, and actuator repositioning.
• Closed Loop Proportional, Integral and
Derivative (PID) control
• Logical sequencing
• Alarm detection and reporting
• Reset schedules
Built-in Energy Management
Applications
The following applications are programmed in the
PXC Modular and require simple parameter input for
implementation:
• Automatic Daylight Saving Time switchover
• Calendar-based scheduling
• Duty cycling
• Economizer control
• Equipment scheduling, optimization and
sequencing
• Event scheduling
• Holiday scheduling
• Night setback control
• Peak Demand Limiting (PDL)
• Start-Stop Time Optimization (SSTO)
• Temperature-compensated duty cycling
• Temporary schedule override
Modular Series Specifications
Dimensions (L × W × D)
PXC Modular 7.56" × 3.54" × 2.76"
(192 mm × 90 mm × 70 mm)
FLN Expansion Module
1.26" × 3.54" × 2.76"
(32 mm × 90 mm × 70 mm)
DIN rail (EN 60715 TH 35-7.5, steel)
1.38" × 0.30" × 0.04
"
(35 mm × 7.5 mm × 1 mm)
Processor, Battery, and Memory
Processor
MPC885 (PowerPC )
Processor Clock Speed
133 MHz
Memory
80 MB (64 MB SDRAM, 16 MB
Flash ROM)
Serial EEPROM
4 KB
Secure Digital (SD) memory card (for future use)
Expandable or removable non-volatile memory
Battery backup of SDRAM
30 days (accumulated),
AA (LR6) 1.5 Volt Alkaline (non-rechargeable)
Battery backup of Real Time Clock
12 months (accumulated),
Coin cell (BR2032) 3 Volt lithium
Real Time Clock Initial Accuracy
±30 seconds/month typical @ 77°F (25°C)