（2）plc的主要功能。plc系统能很好的完成工业实时顺序控制、条件控制、记数控制、步进控制等功能；能够完成模/数（a/d）、数/模（d/a）转换、数据处理、通讯联网、实时监控等功能。
plc如此可靠的原因是一个可执行继电器逻辑、顺序功能图、功能块、结构文本、命令目录或其组合的实时核心或操作系统。若出现故障，其内置安全装置能保持机械受损，且能保持有序、有预见的顺序。
siemens simodrive lt-module 6sn1123-1aa01-0fa1"new"
siemens 6sn2703-3aa10-0ba0 uspp 6sn27033aa100ba0
siemens 6es5535-3ma12
siemens 6av7-870-0bb10-1aa0 nsfp 6av78700bb101aa0
siemens 1la0364-2sp22 nsfp 1la03642sp22
siemens 3f3y300 300 kva 480v to 208/120v 3ph dry typetransformer n1 recond
siemens 6es7-414-2xg01-0ab0 uspp 6es74142xg010ab0
ultrasound transducer-siemens acuson 15l8w for se
siemens 4ap4074-0cb transformer - new, no box
siemens 6av6643-0cd01-1ax1 mp 277 10" touch retentivememory
nxd63b120 siemens 1200amp 3pole 600v nd63b120 new
nxd63b100 siemens 1000amp 3pole 600v nd63b100 new
siemens 6dd1-641-0ac0 nspp 6dd16410ac0
siemens 6av7-800-0bb00-2ac0 nsfp 6av78000bb002ac0
siemens 6es5-928-3ua11 uspp 6es59283ua11
nib siemens perm mag motor 1 ft5064-0ac01-2-z_1ft50640ac012z_zg42_rod320b2000/u
siemens c98043-a1200-l uspp c98043a1200l
siemens 6av3-617-1jc30-0ax1 nsfp 6av36171jc300ax1
siemens hf367n safety switch nema 1 new!
siemens 6es5 928-3ub12 -new- 6es59283ub12
siemens servo motor 1fk6084-6az21-9zz9-z
siemens 800a breaker panel 480y/277 v s5e75ml800ets 3p4w 800 amlo 480 v nema 3r
siemens brushless servo motor 1ft6062-1af71-4ah1
siemens brushless servo motor 1ft6062-1af71-4ea1
siemens 800a breaker panel 480y/277 v s5e75ml800ets 3p4w 800 amlo 480 v 3r
siemens dc motor 1hu3104-0ah01-z
siemens 100 kva transformer never used cat no.: 1d1y100
siemens ac cnc servo motor 1ft6084-1af71-3eg1
siemens (dade behring) dimension xpand plus integratedchemistry system
siemens 3~mot 1ph7 186-2af000ea0-z spindle drive motor,new
siemens servo drive d380/65
siemens midimaster vector 6se3222-4dg40
siemens ac drive 6se7021-3eb61-z