FB_HVACTemperatureCurve

FB_HVACTemperatureCurve 1:

Application

A temperature curve stored internally in the function block is selected from Tables 1 and 2 via the Enum eTemperatureCurve and output via the structure stParameterScale_nPoint. Characteristic curves can then be reproduced with this structure in conjunction with the function block FB_HVACScale_nPoint. In order to arrive at the raw resistance value of a sensor, the KL32xx Bus Terminals must be set to resistance measurement; see FB_HVACConfigureKL32xx.

	When measuring resistances from 10 to 5000 Ω with the KL32xx, 1 digit = 0.5 Ω, i.e. the indicated raw value must be divided by 2 in the PLC. Example: 2500 Ω would be represented in the controller by a raw value of 5000. The raw value must be divided by 2 in the PLC in order to arrive at the ohmic value of 2500 Ω.

	The measurement of resistances from 10 to 10000 Ω is possible only with the special terminal KL320x-0027. Exclusively the resistance measurement 10...10000 Ω can be performed on this special terminal.

	The EL3692 EtherCAT Terminal is a resistance measurement terminal that covers the measuring range up to 10 MΩ.

Application example

Download	Required library
tchvac.zip	TcHVAC.lib

VAR_INPUT

eTemperatureCurve           : E_HVACTemperatureCurve;

eTemperatureCurve: Enum via which a temperature curve stored internally in the function block can be selected from Tables 1 and 2.

VAR_OUTPUT

stParameterScale_nPoint     : ST_HVACParameterScale_nPoint;

stParameterScale_nPoint: structure containing the number of points and their valence of the X-Y coordinates. stParameterScale_nPoint contains the characteristic curves stored in the tables 1 and 2 depending on the specification via the Enum eTemperatureCurve.

Example:

eTemperatureCurve = eHVACTemperatureCurve_Ni1000Tk5000_TCR
stParameterScale_nPoint.iNumberOfPoint := 56;
stParameterScale_nPoint.rX[1] := 790.8;
stParameterScale_nPoint.rY[1] := -50.0;
stParameterScale_nPoint.rX[2] := 826.8;
stParameterScale_nPoint.rY[2] := -40.0;
.
.
.
stParameterScale_nPoint.rX[56] :=1625.4;
stParameterScale_nPoint.rY[56] := 120.0;
stParameterScale_nPoint.rX[57] :=0;
stParameterScale_nPoint.rY[57] := 0;
.
.
.
stParameterScale_nPoint.rX[60] :=0;
stParameterScale_nPoint.rY[60] := 0;

Table 1: specified temperature curves, selectable via the Enum eTemperatureCurve
	S+S Sensor type 1K3 A1 NTC 1 kOhm	S+S Sensor type 1.8K3 A1 NTC 1.8 kOhm	S+S Sensor type 2.2K3 A1 NTC 2.2 kOhm	S+S Sensor type 3.3K3 A1 NTC 3 kOhm	S+S Sensor type NI1000 DIN	S+S Sensor type PT1000 DIN	S+S Sensor type Ni1000/TCR (LAN1) Ni1000Tk5000
eHVACTemperatureCharacteristic_	NTC1k_3_A1	NTC1k8_3_A1	NTC2k2_3_A1	NTC3k3_3_A1	Ni1000_DIN	Pt1000_DIN	Ni1000Tk5000_TCR
°C	Ω	Ω	Ω	Ω	Ω	Ω	Ω
- 50	32886				743	803	790.8
- 40	18641				791	843	826.8
- 30	11130	21695	27886	53093	842	882	871.7
- 20	6777	12987	16502	29125	893	922	913.4
- 15	5341	10153	12844	21887	920	941	934.7
- 10	4247	8011	10070	16599	946	961	956.2
- 5	3390	6347	8134	12698	973	980	978
0	2728	5071	6452	9795	1000	1000	1000
1	2613	4851	6164	9309			1004.4
2	2503	4640	5891	8849			1008.9
3	2399	4441	5631	8415			1013.3
4	2300	4252	5384	8005			1017.8
5	2205	4071	5150	7617	1028	1020	1022.3
6	2115	3899	4927	7251			1026.7
7	2030	3738	4715	6905			1031.2
8	1948	3582	4513	6575			1035.8
9	1870	3434	4321	6265			1040.3
10	1796	3294	4138	5971	1056	1039	1044.8
11	1724	3158	3964	5691			1049.3
12	1656	3029	3797	5427			1053.9
13	1590	2905	3639	5177			1058.4
14	1528	2788	3488	4938			1063
15	1469	2677	3345	4713	1084	1058	1067.6
16	1412	2570	3207	4500			1072.2
17	1358	2468	3076	4298			1076.8
18	1306	2371	2952	4104			1081.4
19	1256	2277	2832	3922			1086
20	1209	2189	2719	3747	1112	1078	1090.7
21	1163	2103	2610	3582			1095.3
22	1120	2023	2506	3426			1100
23	1078	1945	2407	3277			1104.6
24	1038	1871	2289	3135			1109.3
25	1000	1800	2200	3000	1142	1098	1114
26	963	1732	2115	2872			1120
27	928	1667	2034	2750			1123.4
28	894	1604	1957	2634			1128.1
29	862	1545	1883	2522			1132.9
30	831	1488	1812	2417	1171	1117	1137.6
35	694	1235	1500	1960	1200	1136	1161.5
40	583	1031	1248	1597	1230	1155	1185.7
45	491	865	1043	1310	1261	1175	1210.2
50	416	729	876	1081	1291	1194	1235
55	354	616	738	896	1322	1213	1260.1
60	302	524	626	746	1353	1232	1285.4
65	259	447	532	625	1385	1252	1311.1
70	223	383	454	526	1417	1271	1337.1
75	192	329	390	444	1450	1290	1363.5
80	167	284	335	346	1483	1309	1390.1
85	145	246	289	321	1516	1328	1417.1
90	127	214	251	275	1549	1347	1444.4
95	111	187	218	236	1584	1366	1472
100	97	163	190	204	1618	1385	1500
105	88	143	167	176			1528.3
110	76	126	146	138	1688	1423	1557
115		111		120			1586
120		99		105	1760	1461	1625.4
125		88		92
130		80			1833	1498
140		62		64	1909	1536
150		50		50	1987	1573
160					2066	1611
170					2148	1648
180					2232	1685
190						1722
200						1758
210						1795
220						1832
230						1868
240						1905
250						1941
260						1977
270						2013
280						2049
290						2085
300						2121
310						2156
320						2191
330						2227
340						2262
350						2297
360						2332
370						2367
380						2401
390						2436
400						2470

Table 2: specified temperature curves, selectable via the Enum eTemperatureCurve
	Thermokon Sensor type NTC 1.8 kOhm	Thermokon Sensor type Ni1000 Tk5000
eHVACTemperatureCharacteristic_	NTC1K8	Ni1000Tk5000
°C	Ω	Ω
- 50		790.88
- 40		830.83
- 30	24500	871.69
- 20	14000	913.48
- 10	8400	956.24
0	5200	1000
10	3330	1044.79
20	2200	1090.65
25	1800	1113.99
30	1480	1137.61
40	1040	1185.71
50	740	1234.97
60	540	1285.44
70	402	1337.14
80	306	1390.12
90	240	1444.39
100	187	1500
110	149	1556.98
120	118	1615.36
130	95	1675.18
140	77	1736.47
150	64	1799.26