|Product No.||Product Description|
SIMATIC S7-400, EXM 438-1 I/O extension for FM 458 4x analog outputs 16-bit EXM 438-1 not spare part-compatible for EXM438
- 5 analog inputs
- 4 analog outputs 12 bit
- 4 analog outputs 16 bit
- 16 digital inputs
- 8 digital outputs
- 8 incremental encoders, with synchronization capability
- 4 absolute encoders
A fan is required at ambient temperatures above 40 °C.
- SU13 interface module with SC63 cable for all signals without signal conversion.
- SB10, SB71, SU12 interface modules with SC62 cable for digital outputs
- SB10, SB61, SU12 interface modules with SC62 cable for digital inputs
Mode of operation
Coupling to FM 458-1 DP
The EXM 438-1 is connected directly to the FM 458-1 DP basic module via the internal bus. This makes the connection between the FM 458-1 DP and the I/O devices very fast. Only the power supply is obtained from the backplane bus of the SIMATIC rack, data transfer is not handled here. Access to the I/O is via configurable function blocks.
Configuration instead of programming with CFC
The FM 458-1 DP is configured using the well-known software tools STEP 7 and CFC (Continuous Function Chart) which are also used to program the SIMATIC S7-400 controller.
CFC is an intuitive Windows-based program that is easy to learn. The CFC has been expanded to include the function blocks and the optimized operating system using the D7-SYS add-on software package.
EXM 438-1 I/O EXPENSION
Rated value (DC)
Yes; to be set up externally
Current consumption, typ.
Type of output voltage
about 14 V (non-isolated)
Power loss, typ.
Number of digital inputs
-1 to +6 V or input open
+13 to +33V
Input delay (for rated value of input voltage)
for standard inputs
Number of digital outputs
Limitation of inductive shutdown voltage to
Supply voltage +1 V
Supply voltage -2.5 V
80% at 50 °C all outputs 50 mA
Output delay with resistive load