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System Overview SIMATIC 545/555/575 System Manual
System Features (continued)
All CPUs offer the following features:
• Support for I/O expansion using PROFIBUS-DP I/O.
• Support for I/O expansion using Series 505 remote I/O. (Exception: the
545–1103/–1105 cannot use the Series 505 remote I/O channel.)
• Optional password protection for user programs.
• Full support for SIMATIC PCSt.
• Immediate local-base I/O module updates that allow your application
program to access an I/O point multiple times during a CPU scan.
• Cyclic RLL that allows you to create an additional RLL program that
runs independently from the main RLL program.
• External subroutines that allow your program to call externally
developed programs written in high-level languages such as C.
• Proportional-Integral-Derivative (PID) loop functions for process and
batch control.
• Analog alarms.
• Special Function Programs (SFPGMs) and Special Function
Subroutines (SFSUBs) that use a higher level statement-driven
programming language to ease the development of complex programs.
• Tuneable scan timeline.
• Battery backup to maintain a real-time clock and the dynamic state of
user program, variables, and retentive control relays (CRs) in case of a
power outage.
• Ethernet network connectivity, using the H1 or TCP/IP protocols. The
PPX:505–CP1434TF H1 module (Rel. 2.0 and later) or
PPX:505–CP2572 TCP/IP module is required.
• PROFIBUS-FMS network connectivity for master-to-master
communications. The PPX:505–CP5434-FMS module is required.
• A real-time clock that keeps track of both date and time.
Shared Features
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