它们以PRM操作数确定的基准地址为起始值,必需的16位基准地址数目取决于被请求的特别PLC服务类型.参数块用于储存功能块的输入和输出量。SVC_ REQ传递能流,除非指定了错误的功能块数,错误的参数或超出范围基准地址。不同的特殊SVC_REQ功能有另外的引起失败的原因
SQUARE D PKA36200G USPP PKA36200G
BALDOR D74CP NSPP D74CP
COMPUMOTOR PK-130 USPP PK130
ALLEN BRADLEY 284D-FVD2P3Z-10?-CR-3 NSFP 284DFVD2P3Z10CR?
DAWN INDUSTRIES VMERACK USPP VMERACK
INTERMEC 9181C02 USPP 9181C02
KLOCKNER MOELLER N121000CNA USPP N121000CNA
SICK OPTIC ELECTRONIC CLV-260A-0020 USPP CLV260A0020
MITSUBISHI A8GT-70GOT-SB USPP A8GT70GOTSB
CUTLER HAMMER ECN1801EJA NSFP ECN1801EJA
DAWN INDUSTRIES 11-1005686-03 USPP 11100568603
PARAGON C98043-A1220-L USPP C98043A1220L
YASKAWA ELECTRIC CACR-SR44BB1AM-?Y8 NSFP CACRSR44BB1AMY8
GE FANUC IC3600SPRF1 USPP IC3600SPRF1
RELIANCE ELECTRIC T18R1312M-KC USPP T18R1312MKC
FANUC A16B-2200-0843 USPP A16B22000843