Siemens SIMATIC S7-400H System Manual page 137

Module
AI 8x16-bit
Use in voltage measurement
•
Use in indirect current measurement
•
Use in direct current measurement
•
•
•
•
AI 4x15Bit [EEx ib]
You cannot use the module for applications in hazardous areas in redundant mode.
This module is suitable for voltage measurement only with redundant encoders.
It is not suitable for indirect current measurement.
Use in direct current measurement
•
•
•
•
Note: You can only connect 2-wire measuring transducers with a 24 V external supply or 4-wire
measuring transducers. The internal power supply for measuring transducers cannot be used in the
circuit shown in Figure 8-10 because this outputs only 13 V, and so in the worst case would supply
only 5 V to the measuring transducer.
AI 6x13-bit
F module in standard operation
AI 8x0/4...20 mA HART
See
Distributed: Redundant AO dual-channel
AO4x12-bit
AO8x12-bit
AO4x0/4...20 mA [EEx ib]
You cannot use the module for applications in hazardous areas in redundant mode.
AO 8x0/4...20 mA HART
See
NOTICE
You need to install the F Configuration Pack for F modules.
The F Configuration Pack can be downloaded free of charge from the Internet.
You can get it from Customer Support at:
http://www.siemens.com/automation/service&support.
S7-400H
System Manual, 09/2007, A5E00267695-03
The "Wire break" diagnostics function in HW Config must not be activated either when operating
the modules with measuring transducers or when thermocouples are connected.
Use a 250 ohm resistor to convert the current to a voltage; see page 8–32.
Suitable Zener diodes: BZX85C8v2 or 1N4738A (8.2 V because of the 250 ohm input resistance)
Circuit-specific additional error: If one module fails, the other may suddenly show an additional
error of approx. 0.1 %.
Load capability of 4-wire measuring transducers: R
(worst-case: 1 input + 1 Zener diode at an S7 overshoot value 24 mA to R
Input voltage for 2-wire measuring transducers: U
(worst-case: 1 input + 1 Zener diode at an S7 overshoot value 24 mA to U
Suitable Zener diode BZX85C6v2 or 1N4734A (6.2 V because of the 50 ohm input resistance)
Circuit-specific additional error: --
Load capability of 4-wire measuring transducers: RB > 325 ohms
Worst-case: 1 input + 1 Zener diode at an S7 overshoot value 24 mA to RB = (RE * I
Input voltage for 2-wire measuring transducers: Ue–2w < 8 V
Worst-case: 1 input + 1 Zener diode at an S7 overshoot value 24 mA to Ue–2w = RE * I
Distributed I/O Device ET 200M; HART Analog Modules
Distributed I/O Device ET 200M; HART Analog Modules
Using I/Os in S7-400H
10.5 Connecting redundant I/Os
Order number
6ES7 331–7NF00–0AB0
> 610 ohms
B
= (R
B
< 15 V
e-2w
e-2w
6ES7331–7RD00–0AB0
6ES7 336–1HE00–0AB0
6ES7 331–7TF01-0AB0
manual
6ES7332–5HD01–0AB0
6ES7332–5HF00–0AB0
6ES7332–5RD00–0AB0
6ES7 332–8TF01-0AB0
manual
* I + U ) / I )
E max z max max
= R * I + U )
E max z max
U ) / I
max + z max max
+ U
max z max
137