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.
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.
The optional EXM 438-1 input/output expansion module permits direct exchange of signals between the FM 458-1 DP basic module and the installation. The EXM 438-1 is able to record and convert the signals so rapidly that an up-to-date value is available for the FM 458-1 DP in every cycle (from 100 µs).
| Mfr. Part No. | Description |
| 6DD1607-0CA1 | SIMATIC S7-400, EXM 438-1 I/O EXPANSION MODULE FOR FM 458 4 X ANALOG OUTPUTS 16 BIT EXM 438-1 NOT SPAREPART COMPATIBLE TO EXM438 |
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