diff --git a/configurations/sbp1_chassis.json b/configurations/sbp1_chassis.json
index f5cd197..5ecff8a 100644
--- a/configurations/sbp1_chassis.json
+++ b/configurations/sbp1_chassis.json
@@ -48,6 +48,10 @@
             "MaxReading": 0,
             "Name": "Fan02_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM01",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -124,6 +128,10 @@
             "MaxReading": 0,
             "Name": "Fan04_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM02",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -200,6 +208,10 @@
             "MaxReading": 0,
             "Name": "Fan06_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM03",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -276,6 +288,10 @@
             "MaxReading": 0,
             "Name": "Fan08_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM04",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -352,6 +368,10 @@
             "MaxReading": 0,
             "Name": "Fan10_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM05",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -428,6 +448,10 @@
             "MaxReading": 0,
             "Name": "Fan12_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM06",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -504,6 +528,10 @@
             "MaxReading": 0,
             "Name": "Fan14_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM07",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -580,6 +608,10 @@
             "MaxReading": 0,
             "Name": "Fan16_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM08",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -656,6 +688,10 @@
             "MaxReading": 0,
             "Name": "Fan18_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM09",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -732,6 +768,10 @@
             "MaxReading": 0,
             "Name": "Fan20_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM10",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -808,6 +848,10 @@
             "MaxReading": 0,
             "Name": "Fan22_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM11",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",
@@ -884,6 +928,10 @@
             "MaxReading": 0,
             "Name": "Fan24_in",
             "PowerState": "Always",
+            "Presence": {
+                "PinName": "PLUG_DETECT_FAN_ASM12",
+                "Polarity": "Low"
+            },
             "Thresholds": [
                 {
                     "Direction": "less than",