S7-200 Specifications A.5 Table A-5 Specifications for the EM221 Digital Input Module Specifications for EM221 24 VDC, 8 Digital Input Module Description Order Number EM221 24 VDC, 8 Input 6ES7 221–1BF20–0XA0 Physical Size Dimensions (W x H x D) 46 x 80 x 62 mm Weight 150 g Power loss (dissipation) 2W Input Features Number of integrated inputs 8 inputs Input type Sink/Source (IEC Type 1 sink) Input Voltage Maximum continuous permissible 30 VDC Surge 35 VDC for 0.5 s Rated value 24 VDC at 4 mA, nominal Logic 1 signal (minimum) 15 VDC at 2.5 mA, minimum Logic 0 signal (maximum) 5 VDC at 1 mA, maximum Isolation Optical isolation (galvanic) 500 VAC for 1 minute Isolation groups of 4 points Input Delay Times Maximum 4.5 ms Connection of 2-Wire Proximity Sensor (Bero) Permissible leakage current 1 mA, maximum Cable Length Unshielded 300 m Shielded 500 m Number of Inputs ON Simultaneously 40 ° C 8 55 ° C 8 Power Consumption From +5 VDC (from I/O bus) S7-200 Programmable Controller System Manual C79000-G7076-C233-01 30 mA A-21 S7-200 Specifications + 24 VDC common and 24 VDC Input Terminals 1M Note: 1. Actual component values may vary. 2. Either polarity accepted. 3. Optional ground. .0 .1 .2 .3 5.6K Ω 1K Ω 2M .4 .5 .6 .7 24 VDC common and 24 VDC Input Terminals Figure A-8 A-22 + Connector Terminal Identification for EM221 Digital Input 8 x 24 VDC S7-200 Programmable Controller System Manual C79000-G7076-C233-01