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★故障自诊断是系统可维修性设计的重要方面，是提高系统可靠性必须考虑的重要问题。自诊断主要采用软件方法判断故障部分和原因。不同控制系统自诊断的内容不同。PLC有很强的自诊断能力，当PLC出现自身故障或外围设备故障，都可用PLC上具有的诊断指示功能的发光二极管的亮、灭来查找。
总体诊断
根据总体检查流程图找出故障点的大方向，逐渐细化，以找出具体故障，如图2所示。
Baumer electric IFR 08.24.35/K648
MAC Valves PED-614JB 24VDC
ASCO Joucomatic SC G202A052
Beckhoff KL4032
Mean Well DR-120-24
DEIF EQ96-X 1200023002C
Knick VariTrans P 27000 H1-S001
Schleicher SNO4062K 1881586265
Beckhoff CU8005-0000 4-Port USB 2.0 Hub
Balluff BOS00Y0 BOS 21M-XT-LS11-S4 10-30V DC
Balluff BOS00WW BOS 21M-PA-LE10-S4 10-30V DC
KEB EMC-Filter 14E5T60-1001
Bürkert 5470G5/32 00462532
Sensopart FMS12-165 517-51418
Baumer electric IFRK 18.24.36
Dold BA9054/001 0035472
E. Dold BN 5983.53 0031885
Sensopart FR20R-P***4
Nanotec SH4018L1704-B
GETRA MCD3 BN06171B
Contrinex DW-HD-621-M8-100
Digitron model 3900/KNE
Schmersal AES 6112 24 VDC
MURR Elektronik 63020
Baer 7FR5043-2 100-110/220-230 V
50x Weidmüller ZDU 4/3AN 600V 35A 7904180000
Murr 4000-68122-0410010 Code: 76448
E.Dold & Shne BA7924.21 0039707
Baumer electric IFR 18.23.12
Euchner MGB-H-AA1A8-L-114466
E.Dold & Shne BA7924.21 0039707
Baumer electric IFR 18.23.12
Euchner MGB-H-AA1A8-L-114466
ipf OT150176 10-36VDC
E. Dold & Shne ZR720 220V 05115
Allied Telesyn CentreCOM FH812u 10/100
ECONOSTO Secutherm 27765001
Leister 100.296 230V~ /1500W
Bihl + Wiedemann BWU2783 Id. Nr. 14976 AS-i
Kraus & Naimer CG8 ***2110 G15076/001
Parker PSSV32A
Systeme Helmholz 700-321-1BL00
Hirschmann OXDV 245 OXDV245 943144-001
Kraus & Naimer KG64B K600
Euchner NZ1RK-528L060GE-MC2049 093153
Huba Control 694.912011012 13.5-33
Kraus & Naimer CA20B CA20BNL3915VE
Dold BA9054 0033282
B&R Automation X20 System X20DC1396
Dold BA9054/010 Art.Nr.:0057213
PIAB COAX TSSK 0003 TKTB + Batch 641717 + 642572
Berg BZ30 Spez. 3x230V 5A SN:4010A0007 Code:ATQBDMA-1
Gossen Digem f 48x24 A 1564-Y1230
E-T-A ESS20-003-DC24V-3A/6A
Nanotec-Munich Schrittmotor SH5618S1009-A
Dold 2-Handsicherheitsrelais BD5980N
Turck Ni35-CP40-VP4X2
Murr Elektr. MSDD 676210 - 4000-6700
Kriwan Netzspannungswchter 72C115S22
Schneider Electric Multi9 1P-C16 No: 23738BB CE4032SIT2B1CE4032SIT2B1CE4032SIT2B1