所有从站的输出数据按从站地址的从小到大的顺序分块排列，每个从站的输出 数据块的字长度必须为4的倍数。Assign 程序块第一次被调用后，会自动计算 出每个从站的输出数据的地址偏移量，并存放在TF 参数中，长度120个字；RF 参数存放 Assign子程序块被调用后，计算出的每个从站的输入数据块的偏移地 址，长度也为120个字。系统于2002年5月投入运行以来，在以下几方面满足了运行要求：①稳定性：两年来 PLC 系统几乎未出故障，网络运行通畅；②安全性：程序中根据加热炉的安全要求，在汽化冷却系统控制中加入柴油泵与热水循环泵的硬线连锁条件，当 PLC 因种种原因使输出停止时，能启动柴油泵。程序测试表明，无论是柴油泵的启动，还是助燃风机的控制，均满足了安全要求；③功能指标：两年来系统满足了各种板坯的自动定位、跟踪，其中步进梁位置精度在10mm左右、抽钢机的定位精度控制在20mm左右。
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