| 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 |
| Supply voltage |
| 5 V DC | Yes |
| 24 V DC | Yes; to be set up externally |
| Input current |
| Current consumption, typ. | 1.5 A |
| Encoder supply |
| Output voltage | about 14 V (non-isolated) |
| Output current, rated value | 100 mA |
| Output current |
| Short-circuit protection | Yes; Electronic |
| Digital inputs |
| Number/binary inputs | 16 |
| Input voltage |
| Type of voltage / of the input voltage | |
| Rated value, DC | 24 V |
| for signal "0" | -1 to +6 V or input open |
| for signal "1" | +13 to +33 V |
| Input current |
| for signal "0", max. (permissible quiescent current) | 0 mA |
| for signal "1", typ. | 3 mA |
| Input delay (for rated value of input voltage) |
| for standard inputs |
| at "0" to "1", max. | 200 µs |
| Digital outputs |
| Number/binary outputs | 8 |
| Functionality/short-circuit strength | Yes; electronic/thermal |
| Response threshold, typ. | 250 mA |
| Limitation of inductive shutdown voltage to | Supply voltage +1 V |
| Output voltage |
| for signal "0" (DC), max. | 3 V |
| for signal "1" (DC), max. | Supply voltage -2.5 V |
| Output current |
| for signal "1" rated value | 50 mA |
| for signal "1" permissible range for 0 to 40 °C, min. | 100 mA |
| for signal "0" residual current, max. | 20 µA |
| Total switching current | 80% at 50 °C all outputs 50 mA |
| Output delay with resistive load |
| 0 to "1", max. | 15 µs |
| Analog inputs |
| Number of analog inputs | 5; Differential inputs |
| Input ranges (rated values), voltages |
| -10 V to +10 V | Yes; -10 V: +/-4 LSB; to +10 V: +/-4 LSB (1 LSB = 4.88 mV) |
| Input resistance (-10 V to +10 V) | 470 kΩ |
| Analog outputs |
| Number of analog outputs | 8; 4 outputs 16 bit; 4 outputs12 bit |
| Voltage output, short-circuit protection | Yes; relative to frame |
| Voltage output, short-circuit current, max. | 16 bits: 27 mA; 12 bits: 100 mA |
| Output ranges, voltage |
| -10 to +10 V | Yes |
| Analog value creation |
| Integrations and conversion time/ resolution per channel |
| Resolution with overrange (bit including sign), max. | 4 AO: 16 bits, 4 AO: 12 bits, 5 AI: 12 bits |
| Conversion time (per channel) | 4 AO (16 bits): 2 µs; 4 AO (12 bits): 4 µs; 5 AI: 45 µs |
| Encoder |
| Number of connectable encoders, max. | 12; 8 incremental encoders (synchronizable), 4 absolute encoders |
| Connectable encoders |
| Incremental encoder (symmetrical) | Yes |
| Incremental encoder (asymmetrical) | Yes |
| Absolute encoder (SSI) | Yes; Single or multiturn encoder with SSI (synchronous serial) or EnDat interface |
| Encoder signals, incremental encoder (symmetrical) |
| Trace mark signals | 1) for tracks A and B (90° out of phase), poss. with zero pulse N; 2) for separate forward and backward track |
| Input signal | With 0 signal: -5 to 0 V; with 1 signal: +3 to +5 V; permissible input voltage range: differential voltage -5 to +5 V; max. input current: 15 mA (important: not limited on module side!) |
| Input frequency, max. | 2.5 MHz |
| Encoder signals, incremental encoder (asymmetrical) |
| Trace mark signals | Track A and B (phase-shifted by 90 degrees), possibly with zero pulse N |
| Input voltage | with 0 signal: -30 to +4 V (at 15 mA load); with 1 signal: +8 to 30 V (at 15 mA load); permissible input voltage range: differential voltage -30 to +30 V |
| Input frequency, max. | 1 MHz; Track frequency |
| Encoder signals, absolute encoder (SSI) |
| Input signal | 5 V acc. to RS 422 |
| Data signal | Dual-, Gray-, Gray-Excess-Code |
| Clock frequency, max. | 2 MHz; 100 kHz to 2 MHz (depending on cable length) |
| Errors/accuracies |
| Linearity error (relative to output area) | (+/- 1 LSB ) |
| Galvanic isolation |
| Galvanic isolation digital inputs |
| Galvanic isolation digital inputs | No |
| Galvanic isolation digital outputs |
| Galvanic isolation digital outputs | No |
| Galvanic isolation analog inputs |
| Galvanic isolation analog inputs | No |
| Galvanic isolation analog outputs |
| Galvanic isolation analog outputs | No |
| Dimensions |
| Required slots | 1 |
| Weight |
| Weight, approx. | 1 kg |
| Status | Aug 25, 2011 |
