Technical Specifications Of The 338; Pos-Input - Siemens SM 338 Reference Manual

1.1.7

Technical Specifications of the 338; POS-INPUT

Dimensions and Weight
Dimensions B x H x T
(mm)
Weight
Voltages, Currents, Potentials
Rated load voltage L+
•
Range
•
Reverse polarity
protection
Isolation
Permitted potential
difference
•
between input
(M connection) and
central grounding point
of the CPU
Encoder supply
•
Output voltage
•
Output current
Current dissipation
•
From the backplane
bus
•
From the load voltage
L+ (no load)
Power dissipation of the
module
Encoder inputs POS INPUT 0 to 2
Position decoding
Difference signals for SSI
data and SSI clock
Data transfer rate and cable
length of absolute value
encoders (twisted pair and
shielded)
Message duration of the
SSI transmission
•
125 kHz
•
250 kHz
•
500 kHz
•
1 MHz
2
Monoflop time
Product Information on the Reference Manual Programmable Logic Controllers S7-300 Module Data Release 3
A5E00409892-01
40 x 125 x 120
Approx. 235 g
24 VDC
20.4 ... 28.8 V
No
no, only against shield
1 VDC
L+ –0.8 V
max. 900 mA, short
circuit–proof
max. 160 mA
max. 10 mA
typ. 3 W
absolute
according to RS422
•
125 kHz max. 320 m
•
250 kHz max. 160 m
•
500 kHz max. 60 m
•
1 MHz max. 20 m
13 bits 21 bits 25 bits
112 ms 176 ms 208 ms
56 ms 88 ms 104 ms
28 ms 44 ms 52 ms
14 ms 22 ms 26 ms
16 ms, 32 ms, 48 ms, 64 ms
Digital inputs DI 0, DI 1
Isolation
Input voltage
Input current
Input delay
Maximum repeat frequency
Connection of a two–wire
BEROS, type 2
Shielded line length
Unshielded line length
Status, Interrupts, Diagnostics
Interrupts
•
Diagnostic interrupt
Status display of digital
inputs
Group error/fault
Inaccuracy of the encoder value
Free running encoder value acquisition
(Standard Mode)
•
1)
Maximum age
•
1)
Minimum age
•
Jitter
Update rate
Free–wheeling sensor value detection (Fast Mode)
•
1)
Maximum age
•
1)
Minimum age
•
Jitter
Update rate
Synchronous encoder value acquisition
•
Age
no, only against shield
0-Signal: –3 V ... 5 V
1-Signal: 11 V ... 30.2 V
0-Signal: v2 mA
(quiescent current)
1-Signal: 9 mA (typ.)
0 > 1: max. 300 ms
1 > 0: max. 300 ms
1 kHz
Possible
600 m
32 m
Parameters can be
assigned
LED (green)
LED (red)
(2 × Message duration)
+ monoflop time
+ 580 ms
Message duration
+ 130 ms
Message duration
+ monoflop time
+ 450 ms
Evaluation of the message
every 450 ms
(2 ×
Message duration)
+ 400 ms
+ monoflop time
Message duration
+
100 ms
Message duration
+
+ 360 ms
monoflop time
Evaluation of the message
every 360 ms
Encoder value at time T of
i
the current PROFIBUS DP
cycle
17