Installation
2-4 SIMATIC 505–2557 Installation and Operation Guide
Installing and Configuring the Module (continued)
No
hardware changes are required for millivolt inputs. T
o select millivolt
input mode for an input turn OFF the M and L switch for the input channel.
(See Figure 2-2.) T
o select a particular RTD probe for each channel
configure the M and L switch.
ML
0 0 Millivolt
0110
Cu
1 0 100
Pt
1 1 120
Ni
NOTE:
Each channel contains a jumper to select between 2, 3 and 4 wire
RTD elements. (See Figure 2-2, JP68). For 2 wire and 3 wire RTDs no
change is required. For 4 wire RTDs the jumper should be removed and
placed on a single pin for storage.
As shipped the module is ready to accept 2 and 3 wire RTDs. T
o configure
an input channel for 4 wire operation requires the following steps:
1.
Remove the 3 wire select jumper JP68–JP83 for the appropriate input
channel and store on a single pin.
2.
Move 2 input jumpers/channel to the 4 wire position. For example: T
o
configure Channel 1, move JP1 and JP2 to the 4 wire position.
If a 10 Ohm RTD is selected the gain of the input amplifier must be
increased to process the smaller signal levels.
(
See Figure 2-2.) JP49–JP64
are the amplifier gain select jumpers for Channels 1–16. No jumper changes
are required to select 100
or 120
RTD.
Locate JP67 on the printed circuit board to select PLC Login Mode
(See Figure 2-2 ). Standard login is 16 WX registers in the PLC. Advanced
Operating Mode logs in as 16 X, 16 Y, 32 WX and 32 WY registers. Consult
the Siemens 255x Sixteen Channel Advanced Function Programming
Reference Manual part #62–177, if the advanced operating mode is to be
selected.
Locate the Digital Filtering Jumper JP65 (See Figure 2-2). T
o enable digital
filtering, set the jumper in the ENABLED position. Since many analog
input signals contain noise, Siemens recommends using digital filtering
unless maximum response time is required.
Selecting
Temperatur
e or
Millivolt Input
Selecting 2 and 3
Wir
e or 4 W
ire
Operation
Selecting 10 Ohm
R
TD Inputs
Selecting PLC Login
Mode
Selecting Digital
Filtering