如下，通讯数据块中，上面为6SE70（PPO5），下面为MM440（STANDARD TELEGRAM 1，PZD-2/2），上面slot type id为什么为4，3，下面的为2，1？
SLAVE_3.DPADDR
SLAVE_3.DADDR
SLAVE_3.SLOT_5.LADDR
SLAVE_3.SLOT_5.SLOT_ID 4 slot type id
SLAVE_3.SLOT_5.PCD_ADDR 0 process data addreSS
SLAVE_3.SLOT_5.LENGTH 4 slot data length
SLAVE_3.SLOT_5.CONSIST
SLAVE_3.SLOT_6. LADDR
SLAVE_3.SLOT_6.SLOT_ID 3
SLAVE_3.SLOT_6.PCD_ADDR 1
SLAVE_3.SLOT_6.LENGTH A
SLAVE_3.SLOT_6.CONSIST

SLAVE_17.DPADDR
SLAVE_17.DADDR
SLAVE_17.SLOT_5.LADDR
SLAVE_17.SLOT_5.SLOT_ID 2
SLAVE_17.SLOT_5.PCD_ADDR 1
SLAVE_17.SLOT_5.LENGTH 2
SLAVE_17.SLOT_5.CONSIST
SLAVE_17.SLOT_6. LADDR
SLAVE_17.SLOT_6.SLOT_ID 1
SLAVE_17.SLOT_6.PCD_ADDR 1
SLAVE_17.SLOT_6.LENGTH 2
SLAVE_17.SLOT_6.CONSIST