1.1Operating Modes

 

The SIMATIC 505±2557 Sixteen Channel RTD Input Module is a member of

 

Siemens's family of I/O modules compatible with the SIMATIC 505 series

 

programmable controllers. The SIMATIC 505±2557 is designed to translate

 

10 Ohm copper, 100 Ohm platinum and, 120 Ohm nickel RTDs or millivolt

 

input signals into scaled digital words which are then sent to the

 

programmable controller (PLC).

 

The SIMATIC 505±2557 RTD Input Module features built±in independent

 

two, three, or four lead compensation for each RTD input. Support for other

 

RTD types is available through special request from the factory. For

 

technical assistance, contact your Siemens Energy & Automation, Inc.,

 

distributor or sales office.

Asynchronous

The module operates asynchronously with respect to the PLC; a scan of the

Operation

PLC and input sampling of the module do not occur at the same time.

 

Instead, the module will translate all inputs in one module update (20

 

milliseconds maximum) and store the translated words in a buffer memory.

 

The PLC retrieves the stored words from the module buffer memory at the

 

start of the I/O scan.

Compatability with

The SIMATIC 505±2557 has been tested and is compatible with the

Immediate I/O

Immediate read function of the SIMATIC 545 and 555 PLC.

100 Ohm, 10 Ohm,

Each of the module's 16 channels may be configured to receive either a 100

120 Ohm RTDs, or

Ohm platinum RTD or a 120 Ohm nickel RTD or a 10 Ohm copper RTD

Millivolt Inputs

input signal (two, three or four wire) or a DC voltage signal ranging from 0

 

to 100 millivolts. Selection of 10 Ohm, 100 Ohm or 120 Ohm RTDs or

 

millivolts are made via internal switch and jumper settings.

1-2

Description

SIMATIC 505±2557 Installation and Operation Guide

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Siemens 505-2557 installation and operation guide Operating Modes