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Measured-Value
Measuring range 500 mV; card with 31.25 ohm shunt
Representation for
(6ES5 498-1AA51/AA71)
Current Measuring
The 4 to 20 mA range is resolved to 2048 units at an interval of 512 to 2560.
Ranges from 4 to
If you require a representation from 0 to 2048, you must subtract 512 units by
20 mA
software. Please note the following:
Current Limiting
Units
Input Cur-
rent in mA
t i
A
7
6
11
S
2
4096
32.000
0
1
4095
31.992
0
1
3072
24.0
0
1
3071
23.992
0
1
2561
20.008
0
1
2560
20.0
0
1
2048
16.0
0
1
512
4.0
0
0
511
3.992
0
0
384
3.0
0
0
383
2.992
0
0
0
0
0
0
A = Active bit
E = Error bit
OV = Overflow bit
S = Sign
System Manual
C79000-G8576-C199-06
A broken wire signal cannot be emitted.
Detection of the overrange can be achieved by scanning bits 2
A broken wire can be detected with currents < 3 mA.
If you short-circuit the positive and negative terminals of the transducer
when using the 6ES5 498-1AA51 range card (for a two-wire transducer),
the current is limited to about 28 mA. Until the thermal current limiting
circuit responds in the range card (about 3 s), a short-circuit current of
approximately 250 mA flows; this sets the overflow bit for this duration
at all channels.
Byte 0
5
4
3
2
1
0
7
6
10
9
8
7
6
5
4
3
2
2
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
1
1
0
0
0
0
0
0
1
0
1
1
1
1
0
0
0
0
0
0
0
0
Analog Input/Output Modules
Byte 1
5
4
3
2
1
0
2
1
0
2
2
2
A
E
OV
1
1
1
0/1
0
1
Overflow
1
1
1
0/1
0
0
Overrange
0
0
0
0/1
0
0
Short-circuit with two-
1
1
1
0/1
0
0
wire transducer
0
0
1
0/1
0
0
0
0
0
0/1
0
0
0
0
0
0/1
0
0
Rated range
0
0
0
0/1
0
0
1
1
1
0/1
0
0
Range
0
0
0
0/1
0
0
underflow
1
1
1
0/1
0
0
0
0
0
0/1
0
0
Broken wire
9
11
and 2
.
9-71
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