EPRO MMS6823
在S7-400H系统中，一对IM153-2接口模块工作在冗余状态下，可在运行中对IM153-2固件版本进行升级。冗余系统中要求一对IM153-2接口模块的硬件/固件版本必须一致，因此要升级固件版本必须将两个接口模块逐一升级成相同的版本。
在运行中升级需要具备以下条件：
必须用PG直接连接到IM153-2所在的PROFIBUSDP总线上，通过STEP7软件进行升级操作，在冗余系统中IM153-2不支持通过以太网升级固件。因此，PG必须具备DP接口，例如CP5611卡、CP5613卡、CP5512卡或MPI/DP适配器等。
本文涉及的升级步骤适用于下列硬件：
6ES7153-2BA01-0B0
6ES7153-2BA81-0B0
6ES7153-2BA02-0B0
6ES7153-2BA82-0B0
软件需STEP7V5.4或以上版本。
需要保证一对IM153-2工作在冗余状态，都能够在线访问，即保证两接口模块均能通过DP电缆和冗余CPU正常通信。
IM153-2的硬件组态应该和实际硬件一致，而不是作为备件使用（例如实际硬件为6ES7153-2BA01-0B0，而组态为6ES7153-2AA02-0B0）。
升级步骤如下：
1.在网站上下载IM153-2固件。如果没有特殊情况，请下载使用最新版本的固件。
15350678
29230295
将下载的升级包解压缩到硬盘上。
2.将PG直接连接到一个IM153-2所在的PROFIBUSDP总线上。在STEP7的HWConfig中选中要升级的ET200M从站，选择菜单PLCUpdatefirmware，系统将会弹出如下对话框，通过Browse浏览并选中升级文件header.upd。同时激活“Activatefirmwareafterdownload”选项，点击“Run”开始升级。
系统先将升级文件下载到IM153-2中，然后开始升级。下载过程在IM153-2模块上不可见，接口模块仍然能正常工作。升级过程中，IM153-2上所有的LED亮。如果该模块升级前处于激活状态（ACT灯亮），则升级过程中另一个接口模块会自动切换为激活状态与控制器进行数据交换，将不影响卡件的数据读写。
升级完成后，弹出如下窗口，新的固件版本已经启用。
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3.将PG直接连接到另一个IM153-2所在的PROFIBUSDP总线上。重复上述升级步骤。
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