{"id":1446,"date":"2025-04-11T05:10:15","date_gmt":"2025-04-11T05:10:15","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&p=1446"},"modified":"2025-06-10T06:29:57","modified_gmt":"2025-06-10T06:29:57","slug":"mmi203-external-analog-outputs","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/mmi203-product-documentation\/mmi203-external-inputs-and-outputs\/mmi203-external-analog-outputs\/","title":{"rendered":"MMi203: External analog outputs"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

The above picture shows the connections for the two external analog outputs. They are designated analog outputs A and B. Each output can generate a 0-10V signal, with a maximum load current of 5mA, corresponding to a 2KOhm load. The outputs have internal current limiting (which is not the same as being short circuit proof!).<\/p>\n\n\n\n

The analog output voltage is a positive voltage measured with respect to the 0V terminal. It is programmed using the\u00a0AnOutA<\/a><\/code>\u00a0or AnOutB instruction. With\u00a0X<\/a>=0 this will result in 0V out, with X=255 it will result in 10V out.<\/p>\n\n\n\n

The output resolution is 8 bits (256 steps between 0 and full scale) when you use the\u00a0AnOut#<\/a><\/code>\u00a0instructions and 10 bits when you use\u00a0fAnOut<\/a><\/code>. The output is generated as a filtered pulse width modulated (PWM) signal. The filter consists of a simple 100mS RC low pass filter. For a full scale step output change, say from 0V to 10V, this will take 230mS to settle to within 10% of the full change, 450mS to settle to 1% and 550mS to settle to 0.4%.<\/p>\n\n\n\n

NOTE: In the MMi200 the\u00a0OBCA<\/a>\u00a0cannot be used in the same program as Analog outputs A and B. If you attempt to do so you will get a runtime error. Analog outputs I and J (thermistor drive and\u00a0SPice<\/a>\u00a0connector) are not affected.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
This does not affect the\u00a0MMi99<\/a>, MMi201 or MMi203.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
How to blow up the analog outputs<\/h6>\n\n\n\n

Here are some ways of blowing up the analog outputs:<\/p>\n\n\n\n

    \n
  1. Connect the output to any positive voltage over 10V and program a 0V output.<\/li>\n\n\n\n
  2. Short the output to 0V for extended periods of time (it may<\/em> survive)<\/li>\n\n\n\n
  3. Connect the output to a negative voltage, even momentarily.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    The above picture shows the connections for the two external analog outputs. They are designated analog outputs A and B. Each output can generate a…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1434,"menu_order":4,"template":"","class_list":["post-1446","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"\nMMi203: External analog outputs - SPLat Controls<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MMi203: External analog outputs - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"The above picture shows the connections for the two external analog outputs. They are designated analog outputs A and B. 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