Siemens 505-2557 Manual De Usuario

Description

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.

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

The SIMATIC 505–2557 has been tested and is compatible with the
Immediate read function of the SIMATIC 545 and 555 PLC.

Each of the module’s 16 channels may be configured to receive either a 100
Ohm platinum RTD or a 120 Ohm nickel RTD or a 10 Ohm copper  RTD
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.