Siemens SIMATIC S7-300 Module data - Commissioning the SM 334; AI 4;AO 2 X 8;8 Bits

Analog Modules
4-192
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
4.30.1 Commissioning the SM 334; AI 4/AO 2 x 8/8 bits
The analog/output module SM 334; AI 4/AO 2 x 8/8 bits is a non-isolated module.
You cannot program the SM 334; AI 4/AO 2 x 8/8 bits.
Important information on connecting the module
Note
Note when connecting the SM 334 that:
• the analog chassis ground M
ANA
(terminal 15 or 18) is connected to the
chassis ground M of the CPU and/or the interface module (IM). Use a wire
with a minimum cross-section of 1 mm
2
for this.
If there is no ground connection between M
ANA
and M, the module switches
off. Inputs are read with 7FFF
H
; outputs return a value of 0. If the module is run
without a ground connection for some time, it may be destroyed.
• the supply voltage for the CPU and/or the interface module (IM) must not
be connected with reversed polarity. Reverse polarity causes the
destruction of the module because M
ANA
is subjected to an unauthorized high
potential (+24 V).
Addressing
The inputs and outputs of the module are addressed as of the initial module
address.
The address of a channel is obtained from the module start address and an
address offset.
Input Addresses
The following addresses apply to the inputs:
Chan-
nel
Address
0 Initial module address
1 Module start address + 2 bytes address offset
2 Module start address + 4 bytes address offset
3 Module start address + 6 bytes address offset