Specifications

S7-200 Programmable Controller System Manual
448
S7 -200 CPUs that Support Intelligent Modules
The EM 241 Modem module is an intelligent expansion module designed to work with the S7-200
CPUs shown in Table A-47.
Table A-47 EM 241 Modem Module Compatibility with S7-200 CPUs
CPU Description
CPU 222 Rel. 1.10 or greater CPU 222 DC/DC/DC and CPU 222 AC/DC/Relay
CPU 224 Rel. 1.10 or greater CPU 224 DC/DC/DC and CPU 224 AC/DC/Relay
CPU 224XP Rel 2.0 or greater CPU 224XP DC/DC/DC and CPU 224XP DC/DC/Relay
CPU 226 Rel. 1.00 or greater CPU 226 DC/DC/DC and CPU 226 AC/DC/Relay
Installing the EM 241
Follow these steps to install the EM 241:
1. Snap the EM 241 on the DIN rail and
plug in the ribbon cable.
2. Connect 24 VDC from the CPU sensor
supply or external source, and connect
the ground terminal to your system
earth ground.
3. Plug the phone line into the RJ11 jack.
4. Set the country code switches
according to Table A-48. You must set
the s witches before power is applied to
the CPU for the correct country code to
be read.
5. Power the CPU. The green MG
(Module Good) light should come on.
Your EM 241 is now ready to communicate.
Table A-48 Country Codes Supported by EM 241
Code Country Telecom Standard
00 Australia ACA TS--002
01 Aus tria CTR21
02 Belgium CTR21
05 Canada IC CS03
06 China GB3482
08 Denmark CTR21
09 Finland CTR21
10 France CTR21
11 Germany CTR21
12 Greece CTR21
16 Ireland CTR21
18 Italy CTR21
22 Luxembourg CTR21
25 Netherlands CTR21
26 New Zealand PTC 200
27 Norway CTR21
30 Portugal CTR21
34 Spain CTR21
35 Sweden CTR21
36 Switzerland CTR21
38 U.K. CTR21
39 U.S.A. FCC Part 68
RJ11 Jack
Figure A-33 shows the details of the
RJ11 Jack. You can use adaptors to
other standard telephone connectors .
Refer to y our adaptor connector
documentation for more information.
12
3
6
4
5
Pin Description
3Ring
4Tip
Reverse connection is allowed.
Figure A-33 View of RJ11 Jack
Caution
Lightning surges or other unexpected high voltages on the telephone line can damage your EM
241 Modem Module.
Use a commercially available telephone line surge protector, such as are commonly sold for
protection of personal computer modems. Surge protectors can be damaged as they protect
your EM 241 Modem Module. Choose a surge protector with a positive indicator that shows it is
functional.
Check your surge protector regularly to ensure that your EM 241 Modem Module continues to
be protected.