我做的时候，有几路PID就调用几个背景数据块，同样在OB35里调用，OB35周期为100mS，请见下例：
A M 201.0
= L 20.1
BLD 103
AN "MANUL"
A "P1_RUN_FEEDBACK"
JNB _001
CALL FB 41 , DB13
COM_RST :=
MAN_ON :=L20.1
PVPER_ON:=
P_SEL :=
I_SEL :=
INT_HOLD:=
I_ITL_ON:=
D_SEL :=
CYCLE :=T#100MS
SP_INT :=DB5.DBD100
PV_IN :=DB5.DBD104
PV_PER :=
MAN :=DB4.DBD40
GAIN :=8.000000e-001
TI :=T#2S
TD :=
TM_LAG :=
DEADB_W :=
LMN_HLM :=
LMN_LLM :=
PV_FAC :=
PV_OFF :=
LMN_FAC :=
LMN_OFF :=
I_ITLVAL:=
DISV :=
LMN :=DB5.DBD300
LMN_PER :=
QLMN_HLM:=
QLMN_LLM:=
LMN_P :=
LMN_I :=
LMN_D :=
PV :=
ER :=
_001: NOP 0