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Upgrading Existing Series 500 Installations

C-8

SIMATIC 545/555/575 System Manual

C.4 Upgrading an RF-Based 560/560T/565/565P System

Installing an RS-485/RF I/O channel converter allows you to update an

existing 560, 560T, 565, or 565Psystem that uses coaxial (RF) cables with

545, 555, or 575 CPUs, providing the advantages of greater speed and

greater remote distance, and the option of dual media.

To upgrade to a 545/555 system, you need to replace the existing

programmable controller, including its chassis, power supply and all

installed boards, with a Series 505 base, power supply, CPU (545–1104,

545–1106, or 555–1103, –1104, –1105, or –1106), and PPX:505–6860

RS-485/RF I/O channel converter. The upgrade is shown graphically in

Figure C-3.

NOTE: The 545/555 CPU cannot directly replace either a hot backup (HBU)

configuration or a system with more than 15 bases.

1. If the Series 500 remote I/O installation consists of more than one

coaxial (RF) remote I/O channel, combine these channels into a single

remote I/O channel. Refer to the chapter entitled “Cabling and Wiring

the System,” in the SIMATIC 560T/565T System Manual, for

information about installation of a coaxial remote I/O channel.

2. Renumber your bases as necessary.

Each base must use a unique address. Base 0 is reserved for the local

base; remote bases can be numbered between 1 and 15.

3. Modify the I/O configuration in the 545/555 CPU to reflect the channel

number and base number changes.

4. Connect the Series 500 RF-based I/O channel to your 545 or 555 local

base by installing a PPX:505–6860 converter in the slot next to the

CPU. Section C.6 describes how to install the converter in the Series

505 base and connect cabling.

5. Connect a 120-ohm resistor between pins 3 and 8 on the RS-485 I/O

connector of your 545 or 555 CPU. This ensures proper termination of

the I/O channel data lines.

Update time for a special function module is significantly faster when you

install the module in the local base, versus a remote base. You can improve

SF module performance, and scan performance, by replacing your Series

500 SF modules with Series 505 SF modules and installing them in the

545/555 local base.

If all SF modules cannot be installed in the local base, consider placing

low-activity SF modules, such as the ASCII, BASIC, or DCP modules, in a

remote base. Place high-activity modules, such as the NIM or Peerlink, in

the local base.

Upgrading an

RF-based System

to 545/555

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