2.1 Installation and removal procedures
Mounting dimensions (mm)
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S7-1200 Devices Width A Width B
CPU 1211C and CPU 1212C 90 mm 45 mm
CPUs:
CPU 1214C 110 mm 55 mm
8 and 16 point DC and Relay (8I, 16I, 8Q, 16Q, 8I/8Q) 2 and 4 point Analog (4AI, 4AI/4AQ, 2AQ)
45 mm 22.5 mm
Signal modules:
16I/16Q Relay (16I/16Q) 70 mm 35 mm
Communication modules: CM 1241 RS232 and CM 1241 RS485 30 mm 15 mm
The CPUs, SMs and CMs support DIN rail mounting and panel mounting. Use the DIN rail clips on the module to secure the device on the rail. These clips also snap into an extended position to provide screw mounting positions to mount the unit directly on a panel. The interior dimension of the hole for the DIN clips on the device is 4.3 mm.
A 25 mm thermal zone must be provided above and below the unit for free air circulation.
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Installation 2.1 Installation and removal procedures
Installing and removing the S7-1200 devices
The CPU can be easily installed on a standard DIN rail or on a panel. DIN rail clips are provided to secure the device on the DIN rail. The clips also snap into an extended position to provide a screw mounting position for panel-mounting the unit.
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① DIN rail installation ③ Panel installation
② DIN rail clip in latched position ④ Clip in extended position for panel mounting Before you install or remove any electrical device, ensure that the power to that equipment has been turned off. Also, ensure that the power to any related equipment has been turned off.
WARNING
Installation or removal of S7-1200 or related equipment with the power applied could cause electric shock or unexpected operation of equipment.
Failure to disable all power to the S7-1200 and related equipment during installation or removal procedures could result in death, severe personal injury and/or property damage due to electric shock or unexpected equipment operation.
Always follow appropriate safety precautions and ensure that power to the S7-1200 is disabled before attempting to install or remove S7-1200 CPUs or related equipment.
Always ensure that whenever you replace or install an S7-1200 device you use the correct module or equivalent device.
WARNING
Incorrect installation of an S7-1200 module may cause the program in the S7-1200 to function unpredictably.
Failure to replace an S7-1200 device with the same model, orientation, or order could result in death, severe personal injury and/or property damage due to unexpected equipment operation.
Replace an S7-1200 device with the same model, and be sure to orient and position it correctly.
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Installation
2.1 Installation and removal procedures
2.1.1 Installing and removing the CPU
Installation
You can install the CPU on a panel or on a DIN rail.
Note
Attach any communication modules to the CPU and install the assembly as a unit. Install signal modules separately after the CPU has been installed.
To mount the CPU on a panel, follow these steps:
1. Locate, drill, and tap the mounting holes (M4 or American Standard number 8), using the dimensions shown in the mounting dimensions.
2. Extend the mounting clips from the module. Make sure the DIN rail clips on the top and bottom of the CPU are in the extended position.
3. Secure the module to the panel, using screws placed into the clips.
Note
If your system is subject to a high vibration environment, or is mounted vertically, panel mounting the S7-1200 will provide a greater level of protection.
To install the CPU on a DIN rail, follow these steps:
1. Install the DIN rail. Secure the rail to the mounting panel every 75 mm.
2. Hook the CPU over the top of the DIN rail.
3. Pull out the DIN rail clip on the bottom of the CPU to allow the CPU to fit over the rail.
4. Rotate the CPU down into position on the rail.
5. Push in the clips to latch the CPU to the rail.
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Installation 2.1 Installation and removal procedures
Removal
To prepare the CPU for removal, remove power from the CPU and disconnect the I/O connectors, wiring, and cables from the CPU. Remove the CPU and any attached communication modules as a unit. All signal modules should remain installed.
If a signal module is connected to the CPU, retract the bus connector:
1. Place a screwdriver beside the tab on the top of the signal module.
2. Press down to disengage the connector from the CPU.
3. Slide the tab fully to the right.
Remove the CPU:
1. Pull out the DIN rail clip to release the CPU from the rail.
2. Rotate the CPU up and off the rail, and remove the CPU from the system.
2.1.2 Installing and removing a signal module
Installation
Install your SM after installing the CPU.
Remove the cover for the connector from the right side of the CPU.
• Insert a screwdriver into the slot above the cover.
• Gently pry the cover out at its top and remove the cover. Retain the cover for reuse.
Position the SM beside the CPU.
1. Hook the SM over the top of the DIN rail.
2. Pull out the bottom DIN rail clip to allow the SM to fit over the rail.
3. Rotate the SM down into position beside the CPU and push the bottom clip in to latch the SM onto the rail.
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Installation
2.1 Installation and removal procedures
Extend the bus connector.
1. Place a screwdriver beside the tab on the top of the SM.
2. Slide the tab fully to the left to extend the bus connector into the CPU.
Extending the bus connector makes both mechanical and electrical connections for the SM.
Removal
You can remove any SM without removing the CPU or other SMs in place. To prepare for removing the SM, remove power from the CPU and remove the I/O connectors and wiring from the SM.
Retract the bus connector.
1. Place a screwdriver beside the tab on the top of the SM.
2. Press down to disengage the connector from the CPU.
3. Slide the tab fully to the right.
If there is another SM to the right, repeat this procedure for that SM.
Remove the SM:
1. Pull out the bottom DIN rail clip to release the SM from the rail.
2. Rotate the SM up and off the rail. Remove the SM from the system.
3. If required, cover the bus connector on the CPU to avoid contamination.
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Installation 2.1 Installation and removal procedures
2.1.3 Installing and removing a communication module
Installation
Attach the CM to the CPU before installing the assembly as a unit to the DIN rail or panel.
Remove the bus cover from the left side of the CPU:
1. Insert a screwdriver into the slot above the bus cover.
2. Gently pry out the cover at its top.
Remove the bus cover. Retain the cover for reuse.
Connect the units:
1. Align the bus connector and the posts of the CM with the holes of the CPU 2. Firmly press the units
together until the posts snap into place.
Installing the units on the DIN rail or on a panel.
1. For DIN rail mounting, make sure the upper DIN rail clip is in the latched (inner) position and that the lower DIN rail clip is in the extended position for the CPU and attached CMs.
2. Install the CPU and attached CMs as shown in Installing and removing the CPU (Page 24).
3. After installing the devices on the DIN rail, move the lower DIN rail clips to the latched position to lock the devices on the DIN rail.
For panel mounting, make sure the DIN rail clips are pushed to the extended position.
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Installation
2.1 Installation and removal procedures
Removal
Remove the CPU and CM as a unit from the DIN rail or panel.
Prepare for CM removal.
1. Remove power from the CPU.
2. Remove the IO connectors and all wiring and cables from the CPU and CMs.
3. For DIN rail mounting, move the lower DIN rail clips on the CPU and CMs to the extended position.
4. Remove the CPU and CMs from the DIN rail or panel.
Remove the CM.
1. Grasp the CPU and CMs firmly.
2. Pull them apart.
Do not use a tool to separate the modules because this will damage the units.
2.1.4 Installing and removing a signal board
Installation
Prepare the CPU for installation of the SB by removing the power from the CPU and removing the top and bottom terminal block covers from the CPU.
To install the SB, follow these steps:
1. Place a screwdriver into the slot on top of the CPU at the rear of the cover.
2. Gently pry the cover up and remove it from the CPU.
3. Place the SB straight down into its mounting position in the top of the CPU.
4. Firmly press the SB into position until it snaps into place.
5. Replace the terminal block covers.
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Installation 2.1 Installation and removal procedures
Removal
Prepare the CPU for removal of the SB by removing power from the CPU and removing the top and bottom terminal block covers from the CPU.
To remove the SB, follow these steps:
1. Place a screwdriver into the slot on top of the SB.
2. Gently pry the SB up to disengage it from the CPU.
3. Remove the SB straight up from its mounting position in the top of the CPU.
4. Replace the SB cover.
5. Replace the terminal block covers.
2.1.5 Removing and reinstalling the S7-1200 terminal block connector
The CPU, SB and SM modules provide removable connectors to make connecting the wiring easy. To prepare the system for terminal block connector removal:
● Remove power from the CPU.
● Open the cover above the connector.
To remove the connector, follow these steps:
1. Inspect the top of the connector and locate the slot for the tip of the screwdriver.
2. Insert a screwdriver into the slot.
3. Gently pry the top of the connector away from the CPU. The connector will release with a snap.
4. Grasp the connector and remove it from the CPU.
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Installation