{"id":3575,"date":"2019-02-12T16:09:25","date_gmt":"2019-02-12T16:09:25","guid":{"rendered":"https:\/\/cyflexdoc.wpengine.com\/usage-help-manual\/17-i-o-systems\/do_pwm_transfer\/"},"modified":"2026-02-03T14:03:21","modified_gmt":"2026-02-03T19:03:21","slug":"do_pwm_transfer","status":"publish","type":"page","link":"https:\/\/cyflex.com\/index.php\/usage-help-manual\/14-i-o-systems\/do_pwm_transfer\/","title":{"rendered":"do_pwm_transfer"},"content":{"rendered":"
\n

Purpose:<\/h3>\n<\/div>\n
\n
\n

Provide PWM on a Digital Out Bit.<\/p>\n<\/dd>\n<\/dl>\n

Enter:<\/h3>\n
\n
\n

do_pwm_transfer<\/strong> <priority> <process_rate> [+c]<\/p>\n<\/dd>\n<\/dl>\n

Where:<\/h3>\n
\n
\n
\n\n\n\n<\/colgroup>\n\n\n\n\n
\n

priority<\/p>\n<\/td>\n

\n

Specify the system level task priority.<\/p>\n<\/td>\n<\/tr>\n

\n

process_rate<\/p>\n<\/td>\n

\n

Specify the rate at which update the PWM output.<\/p>\n<\/td>\n<\/tr>\n

\n

+c<\/p>\n<\/td>\n

\n

Optional. Specify this flag to indicate a critical task.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/dd>\n<\/dl>\n

Example:<\/h3>\n
\n
\n
1.\u00a0ctrl_specs\u00a0output\u00a0specification: \u00a0
\n#\u00a0Output\u00a0type\u00a0\u00a0\u00a0DO\u00a0PWM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0PWM\u00a0Period\u00a0or\u00a0a\u00a0label\u00a0\u00a0PWM\u00a0enable\u00a0label \u00a0
\n#\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0label\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0containing\u00a0period \u00a0
\nDO\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0air_htr_bit\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a035[sec]\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0air_htr_enab<\/div>\n
\u00a0<\/div>\n
2.\u00a0do_specs\u00a0output\u00a0specification \u00a0
\n#chan\u00a0\u00a0invert\u00a0\u00a0up\u00a0to\u00a04\u00a0functional\u00a0descriptions \u00a0
\n0\u00a0\u00a0\u00a0\u00a0\u00a00\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$-$ \u00a0
\n#lbl\u00a0\u00a0true_desc\u00a0false_desc\u00a0\u00a0true_event\u00a0\u00a0false_event\u00a0\u00a0hst\u00a0\u00a0arm_dsply \u00a0
\nair_htr_bit\u00a0\u00a0ON\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0OFF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$-$\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$-$\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0OFF\u00a0\u00a0\u00a0\u00a0\u00a0OFF \u00a0
\nFor this example, the DO bit ‘air_htr_bit’ will be used to provide a\u00a0\u00a0\u00a0
\nPWM\u00a0output\u00a0that\u00a0will\u00a0have\u00a0a\u00a0base\u00a0period\u00a0of\u00a035\u00a0seconds.\u00a0\u00a0The\u00a0duty\u00a0cycle \u00a0
\nof\u00a0the\u00a0PWM\u00a0will\u00a0be\u00a0the\u00a0value\u00a0of\u00a0the\u00a0_CM\u00a0control\u00a0variable\u00a0for\u00a0the \u00a0
\nassociated\u00a0control\u00a0loop\u00a0and\u00a0the\u00a0value\u00a0of\u00a0the\u00a0LOGICAL_VARIABLE\u00a0\u00a0
\n‘air_htr_enab’ will be used to enable\/disable the PWM output.
\n$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$$-$-$$-$$-$
\nIf\u00a0the\u00a0PWM\u00a0is\u00a0specified\u00a0via\u00a0do_specs,\u00a0then\u00a0the\u00a0format\u00a0of\u00a0the specification\u00a0is: \u00a0
\n#chan\u00a0\u00a0invert \u00a0
\n0\u00a0\u00a0\u00a0\u00a0\u00a00\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0PWM\u00a0\u00a0\u00a0\u00a0\u00a0period\u00a0\u00a0\u00a0\u00a0\u00a0DC_label\u00a0\u00a0[enable_label] \u00a0
\n#label\u00a0\u00a0\u00a0true_desc\u00a0\u00a0false_desc\u00a0\u00a0true_event\u00a0\u00a0false_event\u00a0\u00a0hst\u00a0\u00a0arm_dsply \u00a0
\nwater_htr\u00a0\u00a0\u00a0ON\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0OFF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$-$\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$-$\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0OFF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0OFF \u00a0
\nwhere: \u00a0
\nPWM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0=\u00a0Is\u00a0a\u00a0new\u00a0function\u00a0code\u00a0that\u00a0indicates\u00a0this\u00a0bit\u00a0will\u00a0be used\u00a0as\u00a0a\u00a0PWM\u00a0Output\u00a0bit.\u00a0NOTE:\u00a0If\u00a0the\u00a0PWM\u00a0is\u00a0provided \u00a0
\nby\u00a0the\u00a0Control\u00a0task,\u00a0the\u00a0PWM\u00a0function\u00a0code\u00a0should not\u00a0be\u00a0specified\u00a0for\u00a0the\u00a0DO\u00a0bit. \u00a0
\nperiod\u00a0=\u00a0A\u00a0label\u00a0whose\u00a0value\u00a0will\u00a0be\u00a0used\u00a0as\u00a0the base\u00a0period\u00a0of\u00a0the\u00a0PWM\u00a0output.\u00a0If\u00a0the\u00a0label does not exist it will be created. A numeric\u00a0\u00a0
\nvalue\u00a0may\u00a0be\u00a0specified.\u00a0For\u00a0this\u00a0case,\u00a0the value\u00a0must\u00a0also\u00a0contain\u00a0the\u00a0time\u00a0units, e.g. 30[sec]. \u00a0
\nDC_label\u00a0\u00a0\u00a0\u00a0\u00a0=\u00a0is\u00a0the\u00a0label\u00a0of\u00a0a\u00a0REAL_VARIABLE\u00a0that\u00a0will\u00a0contain desired\u00a0Duty\u00a0Cycle\u00a0for\u00a0the\u00a0PWM\u00a0output.\u00a0If\u00a0the\u00a0label does not exist it will be created. A numeric\u00a0value\u00a0may\u00a0be\u00a0specified.\u00a0For\u00a0this\u00a0case,\u00a0the value\u00a0must\u00a0also\u00a0contain\u00a0units,\u00a0eg.\u00a030[%]. \u00a0
\nenable_label\u00a0=\u00a0The\u00a0label\u00a0of\u00a0a\u00a0LOGICAL_VARAIBLE\u00a0that is\u00a0used\u00a0to\u00a0disable\/enable\u00a0the\u00a0PWM output. If the label does not exist it will
\nbe\u00a0created.\u00a0This\u00a0is\u00a0an\u00a0optional\u00a0argument and\u00a0if\u00a0not\u00a0present\u00a0the\u00a0PWM\u00a0will\u00a0always be\u00a0active. \u00a0
\nwater_htr\u00a0\u00a0\u00a0\u00a0=\u00a0the\u00a0label\u00a0of\u00a0DO\u00a0bit\u00a0that\u00a0will\u00a0provide\u00a0the\u00a0PWM \u00a0
\nThe\u00a0remaining\u00a0fields\u00a0are\u00a0the\u00a0standard\u00a0DO\u00a0specs\u00a0fields. \u00a0
\nFor\u00a0example: \u00a0
\n#chan\u00a0\u00a0invert \u00a0
\n0\u00a0\u00a0\u00a0\u00a0\u00a00\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0PWM\u00a0\u00a0\u00a0\u00a0\u00a0htr_period\u00a0\u00a0\u00a0\u00a0\u00a0DC_water_htr\u00a0\u00a0wtr_htr_enab \u00a0
\n#label\u00a0\u00a0\u00a0true_desc\u00a0\u00a0false_desc\u00a0\u00a0true_event\u00a0\u00a0false_event\u00a0\u00a0hst\u00a0\u00a0arm_dsply \u00a0
\nwater_htr\u00a0\u00a0\u00a0ON\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0OFF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$-$\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$-$\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0OFF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0OFF \u00a0
\nFor this example, the DO bit ‘water_htr’ will be used to provide a\u00a0PWM\u00a0output\u00a0that\u00a0will\u00a0have\u00a0a\u00a0base\u00a0period\u00a0as\u00a0defined\u00a0in\u00a0the\u00a0REAL_VARIABLE\u00a0\u00a0
\n‘htr_period’.\u00a0\u00a0The duty cycle for the PWM is defined in the REAL_VARIABLE ‘DC_water_htr’ and the value of LOGICAL_VARIABLE ‘wtr_htr_enab’ will be used\u00a0to\u00a0enable\/disable\u00a0the\u00a0PWM\u00a0output.<\/div>\n<\/dd>\n<\/dl>\n

Notes:<\/h3>\n
\n
\n

This task is normally started in the go script. It is configured by either ctrl_specs or do_specs. If the control task is providing the control of the PWM duty cycle, the associated loop should have a ‘DO’ output type specified and the DO bit must be specified via do_specs. The syntax of the DO output type for the control specs is: DO <do_bit_label> <period> [enable_label] where:<\/p>\n

<do_bit_label> is the label of the DO bit that provides the PWM output<\/p>\n

<period> is a label or value for the base period of the PWM output<\/p>\n

[enable_label] is an optional label for a variable to enable or disable the PWM output<\/p>\n<\/dd>\n<\/dl>\n

See Also:<\/h3>\n
\n
\n

user_ctrl_specs<\/a>, do_specs<\/a><\/p>\n<\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"

Purpose: Provide PWM on a Digital Out Bit. Enter: do_pwm_transfer <priority> <process_rate> [+c] Where: priority Specify the system level task priority. process_rate Specify the rate at which update the PWM output. +c Optional. Specify this flag to indicate a critical task. Example: 1.\u00a0ctrl_specs\u00a0output\u00a0specification: \u00a0 #\u00a0Output\u00a0type\u00a0\u00a0\u00a0DO\u00a0PWM\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0PWM\u00a0Period\u00a0or\u00a0a\u00a0label\u00a0\u00a0PWM\u00a0enable\u00a0label \u00a0 #\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0label\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0containing\u00a0period \u00a0 DO\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0air_htr_bit\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a035[sec]\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0air_htr_enab \u00a0 2.\u00a0do_specs\u00a0output\u00a0specification \u00a0 #chan\u00a0\u00a0invert\u00a0\u00a0up\u00a0to\u00a04\u00a0functional\u00a0descriptions \u00a0 0\u00a0\u00a0\u00a0\u00a0\u00a00\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0$-$ […]<\/p>\n","protected":false},"author":47,"featured_media":0,"parent":1964,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3575","page","type-page","status-publish","hentry"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages\/3575","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/users\/47"}],"replies":[{"embeddable":true,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/comments?post=3575"}],"version-history":[{"count":0,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages\/3575\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages\/1964"}],"wp:attachment":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/media?parent=3575"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}