描述
本指令与ADD指令相似，是把两个四位BCD数作带借位减法，差值送入指定通道，其操作数同ADD指令。在编写SUB指令语言时，必须指定被减数，减数和差值的存放通道三个数
说明：执行减法运算前必须加一条清进位位指令CLC（41）；被减数和减数必须是BCD数，否则25503置ON，不执行SUB指令；若运算结果有借位，则进位标志继电器25504为ON；若运算结果为零，则专用继电器25506变为ON。
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